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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Does medical abortion hurt?

The medical abortion (or abortion pill) is also known as early abortion and involves taking two sets of tablets. It does not generally involve surgery or an anaesthetic so some women prefer this method. The procedure can cause some discomfort.

After your second set of tablets

  • You'll experience bleeding and some cramping although this may not happen straight away. It's very important you use pads and not tampons to avoid infection. 
  • You'll be advised to take pain relief in the form of Paracetamol and/or Ibuprofen. You can apply a warm pad or (warm) hot water bottle to your abdomen if this makes you more comfortable. Please do not take Aspirin.
  • The cramps you experience may become strong – this is a normal part of the abortion process. 
  • Bleeding may get heavier and you may pass clots. This is usually at the time that you will begin to lose your pregnancy. 
  • Often the pregnancy is passed into the toilet, you may not see it specifically, and this may appear as a clot.
  • Side effects of the medication may include nausea, vomiting, diarrhea and shivering. The onset of these symptoms can be fairly soon following taking the medication, so you need to plan your journey home. We recommend you are accompanied and are driven home.
  • Once the pregnancy has been passed your bleeding will usually lessen and become like a slightly heavier period. It may continue to be quite heavy for a day or two as the uterus needs to contract and return to its normal size. If heavy bleeding occurs for more than two days, or you are soaking more than two pads per hour for two hours or more, call our helpline for advice. 
  • The abortion may take place within four to five hours and is usually completed within one to two days. Very occasionally it can take up to two weeks to pass the pregnancy.
  • We recommend that you arrange a lift home before taking your second tablets and do not attempt to drive yourself or take public transport.

Before you leave the Marie Stopes clinic, a nurse will check how you are feeling and talk you through any aftercare information you need. You will also be given a booklet to take away with you, it is important that you read this. We have a 24-hour advice line if you have queries or concerns about your abortion.

Should you have any worries or concerns read our aftercare section for more detailed advice, or you can call a 24 hour abortion aftercare helpline on 0345 122 1441 (Overseas 0044  345 122 1441, or from The Republic of Ireland 1800 200 374 (Free Phone)) which offers help and advice to women taking the abortion pill.

Remember you can also have counselling at any time during your abortion - before, on the day or afterwards. 

Need to talk about your options?

Our caring, specialist staff are on hand 24/7 to offer expert advice and support – from your initial consultation to treatment aftercare.

Call us now on 0345 300 8090 or email services@mariestopes.org.uk

Stories that matter 

Read our stories that matter page where you will find personal stories sent by women who have had an abortion.