The main symptoms of an ectopic pregnancy are pain low down on one side of the abdomen, vaginal bleeding or dark brown watery discharge, and a missed period with a positive pregnancy test. Symptoms usually begin between weeks 4 and 12 of pregnancy, most often around weeks 5 to 8, which is roughly one to four weeks after a missed period. Sudden severe abdominal pain, pain at the tip of the shoulder, feeling faint or collapsing are emergencies and need immediate hospital assessment.
An ectopic pregnancy is a pregnancy that has implanted somewhere other than the lining of the uterus, most often inside a fallopian tube. It cannot continue safely, and because a fallopian tube is a narrow muscular tube rather than an organ designed to stretch, an ectopic pregnancy that goes unrecognised can bleed into the abdomen. That is the only reason a page like this one needs to exist. Recognised early, an ectopic pregnancy is usually managed calmly and in a planned way. Recognised late, it becomes a surgical emergency.
The difficulty is that the early symptoms are ordinary. Cramping, spotting and a tender lower abdomen happen in perfectly normal pregnancies and in early miscarriage too, so no single symptom tells you where a pregnancy has implanted. What I want you to take from this article is the pattern rather than any one sign: when symptoms typically appear, how the pain tends to behave, why shoulder tip pain matters so much, and the handful of situations in which you should stop reading and go straight to hospital. Around one pregnancy in ninety is ectopic, so this is not rare, and the right response to a worry is a scan, not a search engine.
Symptoms of an Ectopic Pregnancy: What to Look For
Three things together make me want to see someone urgently: a missed period with a positive pregnancy test, pain low down on one side of the abdomen, and vaginal bleeding or brown watery discharge. Each of those on its own is common and usually harmless in early pregnancy. It is the combination, and the way the pain behaves over hours and days, that raises suspicion.
The fuller picture of what an ectopic pregnancy can cause looks like this:
- Pain low in the abdomen or pelvis, usually on one side, that persists rather than passing in a few seconds
- Vaginal bleeding or dark brown, watery discharge, often different in colour and texture from a normal period
- Pain at the very tip of one shoulder, with no injury or awkward night's sleep to explain it
- Pain on opening the bowels, or a feeling of pressure low in the back passage
- Loose stools, or discomfort when passing urine
- Bloating or a feeling of fullness low in the abdomen
- Dizziness, light-headedness on standing, feeling faint, or actually fainting
- Looking pale, clammy or sweaty, with a racing heartbeat
What an ectopic pregnancy feels like
Most women describe something that starts as an unremarkable ache or cramp on one side, deep inside the pelvis rather than on the surface, and then refuses to settle. Over a day or two it becomes more constant and more defined, and movement starts to matter: getting out of a car, coughing, or walking upstairs produces a sharper catch. Some people feel it low down near the groin, some feel it as pressure in the rectum, some mostly notice that they feel generally unwell and off their food. It is rarely dramatic at the beginning, which is exactly why it gets dismissed.
Symptoms that do not help you tell the difference
Nausea, vomiting, tiredness, sore breasts and going off certain foods are produced by pregnancy hormones, and an ectopic pregnancy produces those hormones too. Their presence is reassuring about nothing, and their absence means nothing either. There is also no such thing as an ectopic pregnancy showing as a visible bump. An ectopic pregnancy is found and treated long before anything could be seen from the outside, although abdominal bloating can genuinely make you feel distended.
Finally, some ectopic pregnancies are silent. A proportion are picked up on a scan arranged for another reason, often during fertility treatment or an early reassurance scan, in a woman who feels completely well. Feeling fine is not proof that a pregnancy is in the right place.
When Ectopic Pregnancy Symptoms Start
Symptoms most often begin between the fifth and eighth week of pregnancy, which is about one to four weeks after a missed period. The wider window is roughly four to twelve weeks. Pregnancy weeks here are counted from the first day of your last period, which is how your doctor and your scan report will count them, not from the date of conception.
There is a reason the fifth to eighth week is the usual window. A pregnancy implanted in a fallopian tube grows for several weeks without causing much trouble, and only begins to stretch the tube and erode small blood vessels once it reaches a certain size. The symptoms you feel are the tube being distended and irritated, so they arrive a little after the pregnancy itself would have been detectable on a test.
Signs of an ectopic pregnancy at four weeks
At four weeks most women with an ectopic pregnancy have no symptoms at all beyond a late period and a positive test. If something is noticed this early, it is usually light spotting or a vague one-sided heaviness, and at that stage it is impossible to separate from the entirely normal spotting of early pregnancy. An ultrasound this early often cannot locate a pregnancy either, which is why a scan at four weeks is frequently inconclusive and has to be repeated. So four weeks is too early for reassurance in either direction. If you have a late period, a positive test and one-sided pain, you should be assessed whatever the week count says.
Why some present later
Where the pregnancy has implanted changes the timing. Implantations in the muscle of the uterine corner, where the tube passes through the wall of the uterus, in the scar of a previous caesarean section, in the cervix, or within the abdominal cavity all sit in thick, accommodating tissue. These can stay quiet until nine, ten or twelve weeks before announcing themselves, sometimes abruptly. The opposite holds for the narrow inner part of the tube closest to the uterus: because that segment is the least able to stretch, pregnancies there tend to cause pain, and to rupture, earlier than those in the wider outer portion of the tube where most ectopic pregnancies sit. There is no gestational age at which you can stop paying attention to new one-sided pain in early pregnancy.
One more point about timing: symptoms can begin before you have taken a test. If your period is late and you develop persistent pain on one side, take a pregnancy test first, then seek advice. Doing it in that order saves a great deal of time in the assessment unit.
When Does Ectopic Pregnancy Pain Start, and How Does It Behave?
Pain is usually the first symptom of an ectopic pregnancy, and it most often starts between the fifth and eighth week of pregnancy. It is characteristically on one side, low in the pelvis, and it builds and persists rather than coming and going.
The pattern I ask about in clinic is this. Did it start as a dull ache or a cramp, and has it become more constant? Is it always in the same place, and is that place to one side rather than across the middle? Does moving, coughing or intercourse make it sharper? Is it unrelieved by opening your bowels or passing urine? A yes to most of those changes the urgency of the conversation. Normal early pregnancy twinges, by contrast, tend to be brief, are often felt on both sides or across the lower abdomen, and settle when you rest. Round ligament pain, the fleeting stitch-like pain many women get when they change position, belongs to later pregnancy and is not what we are discussing here.
Pain can also be referred, meaning it is felt somewhere other than where the problem is. Blood collecting in the lowest part of the pelvis, behind the uterus, irritates the structures next to the rectum, which is why some women describe pressure in the back passage, pain on opening the bowels, or a persistent feeling of needing to go. Taken together with a positive pregnancy test, that symptom deserves immediate attention.
There is one deceptive pattern worth naming plainly. If severe pain suddenly eases off, that is not necessarily good news. When a tube ruptures, the pressure inside it drops and the sharpest pain can briefly settle, while bleeding into the abdomen continues. Pain that was severe and then changed character, especially alongside dizziness or feeling unwell, needs emergency assessment and not a wait-and-see approach.
Because one-sided pelvic pain has many possible causes, from ovarian cysts to urinary infection to bowel problems, the context matters more than the sensation itself. If you want to understand the broader range of causes of pain in this area, our overview of pelvic pain in women covers them. But in a woman with a positive pregnancy test, ectopic pregnancy has to be excluded first and everything else considered afterwards.
Shoulder Tip Pain: Why It Happens and Why It Is Urgent
Pain at the tip of the shoulder in early pregnancy must be assumed to be blood irritating the underside of the diaphragm until that has been excluded. It is one of the clearest warning signs of internal bleeding and should be treated as an emergency.
The mechanism is a quirk of anatomy. The diaphragm is supplied by the phrenic nerve, which enters the spinal cord high in the neck, at the same levels that carry sensation from the skin over the shoulder. When blood tracks up from the pelvis and pools under the diaphragm, the brain receives signals through that shared pathway and misinterprets where they came from. The irritation is in your abdomen; the pain is felt at your shoulder. Doctors call this referred pain, and it is the same reason gas used during keyhole surgery can leave people with an aching shoulder for a day or two afterwards.
What it actually feels like is worth describing, because it is easy to confuse with ordinary muscular ache. Women tend to point to the very top of the shoulder, where it meets the arm or towards the collarbone, and describe it as strange rather than sore. It is frequently worse on lying flat or on taking a deep breath, it is not relieved by rubbing or stretching the muscle, it has no injury behind it, and it almost always arrives alongside abdominal pain and a sense of feeling unwell. Because blood can collect under either side of the diaphragm, it may be felt on the left or the right.
A stiff neck, an aching shoulder blade after a bad night's sleep, or soreness after carrying shopping is not this, and most shoulder pain in pregnancy turns out to be musculoskeletal. But the two cannot be separated from a description alone, and in early pregnancy I would far rather assess a woman with a muscular shoulder ache than miss one with blood under her diaphragm. If you are pregnant, or your period is late, and you develop unexplained shoulder tip pain, go to an emergency department the same hour.
Bleeding and Discharge in an Ectopic Pregnancy
Bleeding with an ectopic pregnancy is typically lighter, darker and more watery than a period, often brown rather than red, and it tends to start and stop unpredictably. Some women describe it as looking like prune juice. It can, however, be heavier and redder, and in a meaningful minority of ectopic pregnancies there is no bleeding at all.
Understanding where that blood comes from explains a crucial point. The blood you see is not coming from the fallopian tube. It is coming from the lining of the uterus, which is breaking down because the hormonal support from an abnormally situated pregnancy is faltering. The bleeding that matters clinically in an ectopic pregnancy is internal, into the abdominal cavity, and that bleeding is invisible. The amount of vaginal bleeding therefore tells you nothing about how much you are bleeding inside. A woman with only light brown spotting can be bleeding significantly into her abdomen, which is why pain, dizziness and feeling unwell carry more weight in this situation than the state of your pad.
How it differs from implantation bleeding and from miscarriage
Implantation bleeding is usually very light, lasts a day or two, arrives around the time a period would have been due and is not accompanied by escalating one-sided pain; our guide to implantation bleeding explains the normal pattern in more detail. Miscarriage more often produces central, period-like cramping that comes in waves, with bleeding that gets progressively heavier and may include clots or tissue. An ectopic pregnancy more often produces pain that is one-sided, constant and out of proportion to how much blood is being lost.
These distinctions are useful for understanding what is happening, but they are not reliable enough to act on alone. Early miscarriage and ectopic pregnancy overlap substantially in how they present, and they are told apart by a scan and a blood test, not by description. Any bleeding in early pregnancy should be reported to your doctor or an early pregnancy unit the same day.
What Causes an Ectopic Pregnancy and Where It Can Implant
An ectopic pregnancy happens when a fertilised egg is delayed or obstructed on its journey along the fallopian tube and implants before it reaches the uterine cavity. The large majority occur in a fallopian tube, most commonly in its wider outer portion.
Normally the inner lining of the tube is carpeted with microscopic hair-like cilia that waft the fertilised egg towards the uterus over several days. Anything that damages that lining, scars the tube, narrows it, or kinks it with adhesions can interrupt that transport. Previous infection, previous surgery and endometriosis all do this. In many cases, though, no cause is ever identified, and the tube looks entirely normal at operation.
Less commonly, implantation occurs elsewhere: in the short segment of tube that runs through the muscular wall of the uterus, on the ovary, in the cervix, in the scar of a previous caesarean section, or within the abdominal cavity. Very rarely a pregnancy in the uterus and an ectopic pregnancy occur at the same time, and this is considerably more common after IVF and other assisted reproduction than after natural conception. That has a practical consequence: in a woman who has conceived through fertility treatment, seeing a pregnancy inside the uterus does not on its own exclude a second one in the wrong place, so new one-sided pain still has to be investigated. These unusual locations matter because they change when symptoms appear and which treatments are possible, and they are the reason a scan report will specify exactly where a pregnancy has been seen.
One thing I want to say directly, because I am asked it constantly. An ectopic pregnancy is not caused by anything you did. It is not caused by sex, by exercise, by lifting something heavy, by stress, by travel, by having taken a pregnancy test too early or by any previous decision you made about a pregnancy. It is a problem of tubal transport, and it is not a judgement.
Risk Factors: Who Is More Likely to Have One
The strongest risk factors are a previous ectopic pregnancy, previous surgery on the fallopian tubes, and previous pelvic infection. Knowing your risk category changes how quickly you should be assessed, not whether you need to be.
- A previous ectopic pregnancy
- Previous surgery on the fallopian tubes, including sterilisation and attempted reversal
- Pelvic inflammatory disease, or a past chlamydia or gonorrhoea infection, treated or not
- Endometriosis, or extensive pelvic adhesions from any cause
- Conception through assisted reproduction
- Becoming pregnant with an intrauterine device in place
- Smoking, which affects the function of the cilia in the tube
- Age over 35
- Difficulty conceiving, or a long time to conception
- Previous abdominal or pelvic surgery complicated by infection
Now the important qualification. A large proportion of women who have an ectopic pregnancy have none of these risk factors. This list is a tool for deciding who to scan early and who to watch closely. It is not a checklist you can use to reassure yourself when you have symptoms, and I would not want anyone to delay seeking help because they recognise nothing on it.
Two situations are regularly misunderstood. An intrauterine device and sterilisation both make pregnancy itself very unlikely, so the absolute risk of an ectopic pregnancy in women using them is low. But if a pregnancy test is positive with a coil still in place, or at any time after sterilisation, the chance that the pregnancy is in the wrong place is higher than usual, and that needs an urgent scan rather than a routine appointment.
Fertility treatment is the other. Women conceiving with assisted reproduction are usually monitored closely with early blood tests and scans in any case, which is part of why ectopic pregnancies in this group are often detected before symptoms start. If you are going through this, the stages of monitoring are set out in our walkthrough of IVF step by step, and the early scan built into that process is doing exactly this job.
Emergency Red Flags: When to Go to Hospital Immediately
If you are pregnant, or your period is late, and you have any of the following, call an ambulance or go to the nearest emergency department now. Do not wait for a morning appointment and do not wait to see whether it passes.
- Sudden, severe, or rapidly worsening pain anywhere in the abdomen
- Pain at the tip of the shoulder with no injury to explain it
- Feeling faint, dizzy on standing, confused, or losing consciousness
- Looking very pale, feeling cold and clammy, or a racing heartbeat
- Severe pain with pressure in the back passage or a strong urge to open your bowels
- Vomiting together with one-sided abdominal pain
- Severe pain that was intense and then suddenly changed or eased while you still feel unwell
What a rupture is
If an ectopic pregnancy keeps growing, the tube can tear. Blood then escapes into the abdominal cavity, and because the abdomen can hold a great deal of blood before anything shows externally, a woman can lose a significant volume while looking deceptively well for a short time. This is what produces the combination of severe pain, shoulder tip pain and faintness. It is treatable, and it is treated urgently and surgically, which is why time matters more than certainty here.
Practical things that help
When you arrive, say in your first sentence that you may be pregnant or that your period is late. That single piece of information changes the order in which you are seen. Do not drive yourself; have someone take you or call an ambulance. If staff tell you not to eat or drink, follow that, because it keeps the option of an operation open without delay. Bring any scan reports or clinic letters you have, and take someone with you if you can.
Symptoms that need same-day advice but not an ambulance
A positive pregnancy test with mild one-sided discomfort, or light bleeding without severe pain, should prompt a same-day telephone call to your doctor or an early pregnancy assessment unit. That is not an emergency, but it is not something to leave for a week either.
How an Ectopic Pregnancy Is Diagnosed: hCG and Ultrasound
Diagnosis rests on three things used together: a pregnancy test, a transvaginal ultrasound scan, and sometimes a blood hCG measurement repeated after 48 hours. No single test can do the job on its own, and understanding why saves a lot of anxiety during the waiting.
What hCG levels can and cannot tell you
Human chorionic gonadotrophin, or hCG, is the hormone measured by a pregnancy test. A blood level confirms that you are pregnant and gives a sense of how the pregnancy is progressing, but it cannot tell anyone where the pregnancy is. In a healthy early pregnancy inside the uterus, the level tends to rise steeply, roughly doubling every couple of days. An ectopic pregnancy more often shows a slow rise or a plateau. This is also why a single reading settles very little; it is the change between two samples taken 48 hours apart that carries the information. The overlap between those patterns is real, however, and a reassuringly rising hCG does not exclude an ectopic pregnancy. This is the single most common misunderstanding I have to correct. The number is also not a measure of how healthy the baby is, and comparing your figure to someone else's is not informative.
What the scan is looking for
A transvaginal scan, performed with a slim probe inside the vagina, gives far better resolution of the uterus, tubes and ovaries than a scan through the abdomen, and it is the key test. From about five weeks, a pregnancy sac inside the uterus should become visible. The findings that point towards an ectopic pregnancy are an empty uterus despite a positive test, a mass in the region of the tube that moves separately from the ovary, and free fluid in the pelvis. Occasionally a sac with a visible embryo is seen outside the uterus, which is diagnostic.
Pregnancy of unknown location, and why waiting is sometimes correct
If the test is positive and the scan can see a pregnancy neither inside nor outside the uterus, the situation is called a pregnancy of unknown location. This is common, particularly very early on, and it is not a failure of the scan. The usual approach is to repeat the hCG after 48 hours and often to rescan a week later, watching which way the pattern moves. You should be given clear instructions about what symptoms would mean coming back immediately, and you should be able to reach someone at any hour. If you have not been given that safety net, ask for it. Monitoring of this kind is part of routine early pregnancy follow-up, and the repeat testing is there to make a diagnosis safely, not to delay one.
Rarely, when scans and blood tests remain inconclusive and symptoms persist, a diagnostic laparoscopy, a keyhole look inside the abdomen, is needed to settle the question.
Treatment Options and How the Decision Is Made
There are three approaches: careful observation, medical treatment with an injection of methotrexate, and surgery. An ectopic pregnancy cannot be moved into the uterus, and no treatment can make it continue. I say that early because it is almost always the first question, and because I would rather answer it honestly than let anyone discover it halfway through a consultation.
Expectant management means close observation with repeated blood tests, used when the pregnancy is small, hCG levels are low and already falling, there is little or no pain and the woman is well. Some ectopic pregnancies resolve on their own, and in a carefully selected situation watching is a legitimate medical plan rather than doing nothing.
Medical treatment uses methotrexate, a drug that stops rapidly dividing cells from multiplying, given by injection. It suits women who are clinically well, have no sign of internal bleeding, have a relatively small ectopic pregnancy with no heartbeat seen, and can attend for repeated blood tests until the hCG falls to zero, which can take several weeks. There are important practicalities. Some abdominal pain in the days afterwards is expected but must always be reported so that it can be distinguished from a rupture. Alcohol and supplements containing folic acid are avoided during treatment, sun exposure needs care, and conception should be avoided for about three months afterwards, so contraception needs discussing before you leave.
Surgery is the right answer when there is significant pain, signs of bleeding into the abdomen, a larger ectopic pregnancy, a visible heartbeat, or when a woman is unwell or cannot commit to weeks of follow-up. Wherever possible it is performed as keyhole surgery, either removing the affected tube or opening the tube and removing the pregnancy while leaving the tube in place; the general principles of this approach are covered in our page on laparoscopic surgery. If there is heavy internal bleeding, an open operation is sometimes faster and safer, and that decision is made in the moment.
Which route is chosen depends on how you are clinically, including your blood pressure and pulse, your hCG level and its trend, the size and site of the pregnancy, whether a heartbeat is seen, how much free fluid there is, the condition of the other tube, your own plans for future pregnancies, and how easily you can get back to hospital. It is a genuine discussion, and in stable situations your preference carries real weight.
Conditions That Cause the Same Symptoms
Most women with one-sided pain and a positive pregnancy test do not turn out to have an ectopic pregnancy. Several other conditions produce a very similar picture, and knowing this should make you readier to be assessed, not less.
Early or threatened miscarriage is the commonest alternative and overlaps substantially, although the cramping is more often central and comes in waves. A corpus luteum cyst, the small cyst that normally forms on the ovary after ovulation and supports early pregnancy, can ache on one side and is a frequent and entirely benign finding on an early scan. An ovarian cyst that bleeds into itself, ruptures, or twists on its stalk causes sharp one-sided pain that can be severe, and the symptom patterns are set out in our guide to ovarian cyst symptoms. Urinary tract infection, appendicitis, pelvic inflammatory disease, constipation and irritable bowel symptoms all appear on the same list.
Here is the honest limitation of all of this. These conditions are separated from each other by examination, a scan and a blood test, not by how the pain is described, and not by reading about them. Appendicitis and an ectopic pregnancy can feel identical to the person experiencing them. Please do not use this section to talk yourself out of being seen; use it to stop assuming the worst while you arrange to be.
After an Ectopic Pregnancy: Recovery and Future Pregnancies
Physical recovery usually takes a few weeks, emotional recovery often takes longer, and your outlook for a future pregnancy depends on the state of your remaining tube, your age and what was found at operation.
After keyhole surgery, expect tiredness for two to four weeks, some shoulder and upper abdominal discomfort from the gas used during the operation, and light bleeding that settles. After methotrexate, expect weekly blood tests until the hormone level reaches zero, and some days of abdominal discomfort. Either way, a period usually returns within about four to six weeks. New or worsening pain, fever, heavy bleeding or feeling faint during recovery should be reported straight away rather than attributed to the treatment.
The emotional side deserves more attention than it usually gets. An ectopic pregnancy is both a bereavement and a medical emergency arriving at the same time, often within days of a positive test, and frequently before anyone else knew you were pregnant. Shock at how quickly everything happened, grief, anger, and anxiety about trying again are all ordinary reactions, and they do not follow a tidy timetable. Support is available through your doctor and through dedicated pregnancy loss organisations, and asking for it is a reasonable thing to do.
For the future, two practical points. The chance of another ectopic pregnancy is higher than it was before, so in a future pregnancy you should contact your doctor as soon as the test is positive and arrange a scan at around six to seven weeks rather than waiting for a routine appointment. That single step is the most useful thing you can do. Second, anything modifiable is worth addressing in the meantime: stopping smoking genuinely helps tubal function, and if a sexually transmitted infection was identified, completing treatment and ensuring partners are treated reduces further tubal damage.
If you have had a tube removed, the remaining tube can still work, and conception is still possible. Whether to investigate further, and when, depends on your age, how long you have been trying and what was found at operation, which is a conversation to have with your own doctor rather than something to settle from an article.
References
The following current and independent health sources were used in preparing this article.
