An ectopic pregnancy is when a fertilised egg implants itself outside of the womb, usually in one of the fallopian tubes.
This means the egg will not develop into a baby, which can be devastating to the pregnant woman.
In a few cases an ectopic pregnancy causes no noticeable symptoms and is only detected during routine pregnancy testing. However, most women do have symptoms and these usually become apparent between week five and week 14 of pregnancy.
Read more about the symptoms of an ectopic pregnancy.
How is an ectopic pregnancy treated?
If an ectopic pregnancy is detected at an early stage, a medication called methotrexate is sometimes needed to stop the egg developing. The pregnancy tissue is then absorbed into the woman's body.
But methotrexate is not always needed, as in around half of cases the egg dies before it can grow larger.
Ectopic pregnancies detected at a more advanced stage will require surgery to remove the egg.
If an ectopic pregnancy is left to develop, there is a risk that the fertilised egg could continue to grow and cause the fallopian tube to split open (rupture), which can cause life-threatening internal bleeding.
Signs of a ruptured fallopian tube are:
A ruptured fallopian tube is a medical emergency. If you think that you or someone in your care has experienced this complication, call 999 and ask for an ambulance.
Read more about treating ectopic pregnancy.
Why does an ectopic pregnancy happen?
In a normal pregnancy an egg is fertilised by sperm in one of the fallopian tubes, which connect the ovaries to the womb. The fertilised egg then moves into the womb and implants itself into the womb lining (endometrium), where it grows and develops.
An ectopic pregnancy occurs when a fertilised egg implants itself outside the womb. It most commonly occurs in a fallopian tube (this is known as a tubal pregnancy), usually as the result of damage to the fallopian tube or the tube not working properly.
Less commonly (in around 2 in 100 cases), an ectopic pregnancy can occur in an ovary, in the abdominal space or in the cervix (neck of the womb).
Things that increase your risk of ectopic pregnancy include:
In around half of all cases, there are no obvious risk factors.
Read more about the causes of, and risk factors for, an ectopic pregnancy.
Losing a pregnancy can be devastating and many women feel the same sense of grief as if they had lost a family member or partner.
It is not uncommon for feelings of grief and bereavement to last for 6-12 months, although these feelings usually improve with time.
Trying for another pregnancy
It is normally recommended that you wait for at least two menstrual cycles before trying for another pregnancy, as this will allow time for your fallopian tubes to recover (if treated with methotrexate, you will need to wait at least three months). However, many women are not emotionally ready to try for another pregnancy so soon.
Your chances of having a successful pregnancy will depend on the underlying health of your fallopian tubes. In general, 65% of women achieve a successful pregnancy 18 months after having an ectopic pregnancy.
If you cannot conceive in the normal way then fertility treatment such as in-vitro fertilisation (IVF) may be an option.
IVF treatment is where an egg is fertilised by a sperm outside the womb (usually in a test tube) and, after fertilisation, the embryo is surgically implanted into the womb.
Who is affected
It is estimated that around 1 in 90 pregnancies in the UK develops into an ectopic pregnancy. This is around 10,700 pregnancies a year.
Nowadays, deaths from ectopic pregnancies are extremely rare. There was only one death in England and Wales due to an ectopic pregnancy in 2010.
Symptoms of ectopic pregnancy
Some women who have an ectopic pregnancy do not experience any symptoms. The pregnancy may not be found to be ectopic until an early scan shows up the problem or a woman's fallopian tube has ruptured.
If there are symptoms, they usually appear between weeks five and 14 of the pregnancy. They are outlined below.
One-sided abdominal pain
You may experience pain, typically on one side of your abdomen (tummy), which can be persistent and severe.
Vaginal bleeding is a different type of bleeding from your regular period. It often starts and stops, and can be bright or dark red in colour. Some women mistake this bleeding for a regular period and do not realise they are pregnant.
Shoulder tip pain
Shoulder tip pain is felt where your shoulder ends and your arm begins. It is not known exactly why shoulder tip pain occurs, but it usually occurs when you are lying down and is a sign that the ectopic pregnancy is causing internal bleeding.
The bleeding is thought to irritate the phrenic nerve, which is found in your diaphragm (the muscle used during breathing that separates your chest cavity from your abdomen). The irritation to the phrenic nerve causes referred pain (pain that is felt elsewhere) in the shoulder blade.
You may experience pain when passing urine or stools.
Diarrhoea and vomiting
An ectopic pregnancy can cause similar symptoms to a gastrointestinal disease and is often associated with diarrhoea and vomiting.
When to seek medical advice
You should always contact your GP if:
When to seek emergency medical treatment
The most serious symptom of an ectopic pregnancy is known as 'collapse'. This occurs when an ectopic pregnancy has split open the fallopian tubes (tubal rupture) and is causing dangerous internal bleeding.
People who have experienced collapse describe feeling lightheaded and faint. You may also:
If your fallopian tubes rupture, you will need emergency surgery to prevent blood loss. Dial 999 immediately and ask for an ambulance.
In rare cases, a ruptured fallopian tube can be fatal, but in most cases the fallopian tube can be successfully repaired or removed.
Causes of ectopic pregnancy
In the early stages of pregnancy, an egg is released from one of your ovaries into one of your fallopian tubes, where it is fertilised by sperm.
Each fallopian tube is about 10cm (4 inches) long and lined with millions of moving hair-like structures called cilia. In a normal pregnancy the cilia push the fertilised egg along the tube and into the womb, where the egg implants itself into the womb's lining (endometrium) and develops into a baby.
However, if the fallopian tube has been damaged (for example, if there is a blockage or narrowing in the tube), the cilia may not be able to move the egg to the womb and the pregnancy may develop in the fallopian tube.
Common risk factors
Some of the most common risk factors for an ectopic pregnancy are discussed below.
Pelvic inflammatory disease
Pelvic inflammatory disease (PID) is a bacterial infection of the female reproductive system. Most cases of PID are caused by an infection in the vagina or the neck of the womb (cervix) that has spread to the reproductive organs higher up.
Many different types of bacteria can cause PID, but most cases are the result of a chlamydia infection, which is a type of sexually transmitted infection that can be spread during unprotected sex.
Chlamydia often exhibits no noticeable symptoms, so women may be unaware they are infected. But the bacteria can cause inflammation of the fallopian tubes, which is known as salpingitis. Salpingitis leads to a four-fold increase in the risk of having an ectopic pregnancy.
Having a previous history of ectopic pregnancy means that you have an increased risk of having one in the future compared to other women.
Depending on the underlying factors, the risk of having another ectopic pregnancy is somewhere between 1 in 10 and 1 in 4.
If you have ever had surgery that involved your fallopian tubes, you have an increased risk of having an ectopic pregnancy. Types of surgery known to increase your risk include:
Taking medication to stimulate ovulation (the release of an egg) can increase the risk of ectopic pregnancy by around four-fold.
In addition, the type of fertility treatment known as in-vitro fertilisation (IVF) is not always successful and can accidentally result in an ectopic pregnancy.
This occurs in around 1 in 22 cases of IVF.
The intrauterine device (IUD) and the intrauterine system (IUS) types of contraception are usually very effective in preventing pregnancy - estimated to be effective in around 99 out of 100 cases. But if a pregnancy does occur when using these types of contraception, it is more likely to be an ectopic pregnancy than a normal pregnancy.
There is also a risk that if you take emergency contraception and it fails to work, any subsequent pregnancy could be an ectopic pregnancy.
Other risk factors
Other potential risk factors for an ectopic pregnancy include:
Diagnosing ectopic pregnancy
If you start to have symptoms of an ectopic pregnancy a few weeks into your pregnancy, you may be offered a blood test to measure blood levels of the hormone human chorionic gonadotropin (hCG), which is produced by placental tissue.
The hCG levels are usually lower than normal if your pregnancy is ectopic or you are going to have a miscarriage.
A transvaginal ultrasound scan is usually used to diagnose an ectopic pregnancy.
An ultrasound scan uses high frequency sound waves to create an image of your reproductive system.
A small probe is inserted into your vagina to take a close-up image of your womb and surrounding areas. It will usually show the location of your pregnancy.
If a diagnosis of ectopic pregnancy has still not been confirmed, a laparoscopy may be performed.
This is a direct examination of the womb and fallopian tubes using a viewing tube (a laparoscope), which is passed through a small opening in the wall of your abdomen.
The procedure is done under general anaesthetic (you are put to sleep).
Treating ectopic pregnancy
The baby cannot be saved in an ectopic pregnancy.
If the ectopic pregnancy is diagnosed before your fallopian tube ruptures, you have the following treatment options:
Your specialist or gynaecologist will be able to advise you about the benefits and risks of each option.
If you are only experiencing mild symptoms then there is a chance that the pregnancy will resolve by itself. The fertilised egg will die and then be absorbed into nearby tissue without the need for treatment.
This is more likely if your blood tests show low levels of the human chorionic gonadotropin (hCG) hormone.
If you decide on this option, you will still need to have regular blood tests and in some cases ultrasound scans to assess the progress of the pregnancy.
If tests do not show a continued drop in the hCG levels, additional treatment will be required (this is usually the case in around one in three cases treated using active monitoring).
The advantage of active monitoring is that you won't have to experience any side effects of treatment.
A disadvantage is that there is still a small risk of your fallopian tubes splitting open (tubal rupture), even if blood tests show low levels of the hCG hormone.
If an ectopic pregnancy is growing but is diagnosed early enough, it can be ended using a medicine called methotrexate.
Methotrexate works by stopping the growth of the embryo cells. It is usually only suitable if the egg is no larger than 3.5cm in diameter.
Methotrexate may also not be suitable if you have one or more of the following conditions:
If methotrexate is recommended for you, your condition will need to be closely monitored through regular blood tests after you have taken the medicine.
Methotrexate is usually given as a single injection into your buttocks. Sometimes, a second dose is required.
You need to use reliable contraception for three to six months (depending on how many doses) after taking methotrexate as there is an increased risk of development problems in your next baby if you become pregnant after being given the medication.
It is also important to avoid drinking alcohol until you are told it is safe to do so, as drinking soon after receiving a dose of methotrexate can damage your liver.
The most common side effect of methotrexate is abdominal pain, which usually develops a day or two after receiving a dose. This pain is usually mild and should pass within 24-48 hours.
Other side effects can include:
You will need to have blood tests around days four and seven after taking methotrexate. If the test does not show a significant drop in hCG levels, you may need surgery.
There is still around a one in 14 chance of your fallopian tubes splitting open (rupture) after medical treatment with methotrexate, even if your hCG levels are going down. Therefore, be aware of the potential symptoms of a rupture and be ready to call an ambulance if you think a rupture has occurred.
Surgery to remove the egg is the most common treatment for an ectopic pregnancy. Keyhole surgery (laparoscopy) is normally used.
This is where a tiny camera and surgical instruments are inserted through small cuts in your abdomen. If your fallopian tube has been damaged, it may also need to be removed (this procedure is called a salpingectomy).
To avoid having two surgical procedures, surgery to remove an ectopic pregnancy or fallopian tube is sometimes done at the same time as a laparoscopy to confirm your ectopic pregnancy.
Your consultant will explain the chance of this happening to you before you go into hospital and will ask your consent to remove your fallopian tubes, if this is found to be necessary.
Most women can leave hospital a few days after surgery, although it can take up to a month before you feel fully recovered.
If your fallopian tube has ruptured, you will need emergency surgery. The surgeon will make an incision in your abdomen (a laparotomy) to stop the bleeding and if possible, repair your fallopian tube.
Once your ectopic pregnancy has been treated, you may want to consider making a follow-up appointment with your GP.
Your GP should be able to discuss a number of issues, such as:
Complications of ectopic pregnancy
Avoiding physical complications
To avoid complications, it is important that an ectopic pregnancy is diagnosed as early as possible.
The later an ectopic pregnancy is diagnosed and treated, the more likely it is that your fallopian tubes will be damaged, leading to an increased likelihood of having another ectopic pregnancy in the future.
You will also be at a higher risk of a ruptured ectopic pregnancy (when the fallopian tube splits) and severe internal bleeding, which can lead to shock (when your blood pressure suddenly drops to a dangerously low level), and very rarely death (there is around one death a year in England due to an ectopic pregnancy).
In the UK, many women who have an ectopic pregnancy receive early diagnosis and treatment and avoid these types of complications. Some early pregnancy clinics will screen for an ectopic pregnancy using ultrasound in women thought to be at increased risk of having an ectopic pregnancy (such as having a previous history of ectopic pregnancy or pelvic inflammatory disease).
In general, 65% of women achieve a successful pregnancy 18 months after having an ectopic pregnancy.
The emotional impact of an ectopic pregnancy
The loss of a pregnancy can have a profound emotional impact, not only on the woman herself but also on her partner, friends and family.
The most common emotions that are felt after an ectopic pregnancy are grief and bereavement.
Physical symptoms of grief and bereavement include:
Emotional symptoms of grief and bereavement include:
These types of symptoms are often worse four to six weeks after the loss of pregnancy before gradually improving, but it can sometimes take up to 12 months for feelings such as distress to pass.
If you are worried that you or your partner are having problems coping with grief, you may need further treatment and counselling. Support groups can provide or arrange counselling for people who have been affected by loss of a pregnancy.
Your GP can provide you with support and advice and the following organisations can also help:
Preventing ectopic pregnancy
You cannot always prevent ectopic pregnancy from occurring, but you can reduce your risk by protecting yourself against pelvic inflammatory disease (PID).
PID is thought to be the leading cause of ectopic pregnancies as it can damage your fallopian tubes.
The male condom is the most effective method of preventing STIs. It is also important to have regular sexual health check-ups:
You can have a sexual health check-up by visiting your local genito-urinary medicine (GUM) or sexual health clinic. To find your local clinic see the NHS Choices service directory.
Read more about the health benefits associated with using a condom and safe sex.
Stopping smoking if you smoke will also lower your risk of ectopic pregnancy as well as many other serious health conditions such as lung cancer, stroke and heart disease.
If you decide to stop smoking, your GP will be able to refer you to an NHS Stop Smoking Service, which will provide you with dedicated help and advice about the best ways to give up smoking. You can also call the NHS Smoking Helpline on 0800 022 4332 (7am-11pm). The specially trained helpline staff will be able to offer you free expert advice and encouragement.
If you are committed to giving up smoking but do not want to be referred to a stop smoking service, your GP should be able to prescribe medical treatment to help with any withdrawal symptoms that you may experience after giving up.
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