Gestation Calculator

This calculator has been designed to give you an idea of the treatment options available to you*. If you decide to have an abortion with Marie Stopes UK, one of our nurses will give a more approximate gestation date during your appointment by way of a scan.
*Please note that this online calculator will only give you an estimated gestation based on the details you have provided.

Please select the first day of your last menstrual period.



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What is an ectopic pregnancy?

An ectopic pregnancy is when a pregnancy develops outside of the womb (or uterus). Most develop in the fallopian tubes, hence the term 'tubal' pregnancy.

When the afterbirth attaches itself in the wrong place the pregnancy cannot survive. It is estimated that an ectopic pregnancy happens in 1 in 150 pregnancies.

Am I at risk of an ectopic pregnancy?

An ectopic pregnancy is a natural event and anyone is at risk. That risk might be higher however if you have any of the following:

  • Scar tissue in the tubes and/or adhesions in the pelvis left behind from a previous infection or previous surgery; this may impede the movement of the fertilised egg.
  • An abnormailty of the genital organs, such as a uterine horn or other birth defect.
  • Rarely, a pregnancy may implant on the scar from a previous caesarean section.

The risk of having an ectopic pregnancy is also increased in the following circumstances:

  • Above 35 years of age
  • Previous ectopic pregnancy
  • Previous pelvic or abdominal surgery
  • Pelvic Inflammatory Disease (PID) or endometriosis
  • Women using an IUD (coil) for contraception
  • If a woman has had female sterilisation which has failed

Signs and symptoms

The signs and symptoms of an ectopic pregnancy reflect internal bleeding and include:

  • Sharp or stabbing pains in the lower abdomen. Initially, these may come and go and vary in intensity. The pain may be predominantly on one side and may become constant. Pain or discomfort may also be felt in the shoulder area due to leaking blood reaching the upper abdomen.
  • Feelings of weakness and dizziness, and fainting, usually reflects severe pain and internal bleeding.
  • Feeling very unwell and collapsing may occur if the ectopic pregnancy ruptures internally. This is an emergency, life-threatening situation.
  • Vaginal bleeding is normally dark and resembles a miscarriage, due to the fact that there is no pregnancy in the womb.

If you suspect you have an ectopic pregnancy you should contact a medical professional urgently. If you are in any pain, attend your local hospital.

If an ectopic pregnancy is suspected, it is not appropriate to carry out an abortion (if required) until further investigations have confirmed that the pregnancy is in the womb. If it is identified, it can be dealt with by keyhole or open surgery.