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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I’m pregnant – what are my choices?

If you've had a positive pregnancy test, you may have mixed feelings about the pregnancy and your options.

The decision you make about the pregnancy is very important – you should give yourself time to consider your situation. It's important to face what's happening and seek advice as soon as possible. 

It's also important to make the right decision for you; this might not be the decision your friends or family would make.

Try and talk it over with someone. If you feel unable to talk to friends or family, you can speak to a Marie Stopes UK counsellor, your GP, or if you're under 25 – a Brook counsellor. Marie Stopes UK takes your privacy seriously and any counselling conversations will be confidential. Read about our counselling services.

If you're not sure what to do, you have three choices to consider.

These are:

  1. Continue with the pregnancy and become a parent. Should you wish to do this, contact your GP who will arrange antenatal care.

  2. Continue with the pregnancy and consider adoption or fostering. If you don't want to become a parent, contact the British Adoption and Fostering Association. If you live in Ireland, contact the Irish Family Planning Association

  3. End the pregnancy through abortion. If you don't want to continue with the pregnancy, contact your GP, family planning clinic or Marie Stopes United Kingdom clinic. They will be able to advise you on abortion options, and whether you can access abortion through the NHS.


If your GP refuses to discuss or refer you for abortion, you have the right to see another GP or go to a family planning clinic. It's important for you to know how many weeks pregnant you are, as this will affect your options. Medical abortion (the abortion pill), for example, is only recommended for women up to 9 weeks + 4 days pregnancy at Marie Stopes UK. 

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