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

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How to prepare for your treatment

If you are travelling to Marie Stopes UK form Ireland, here are some things you should think about before you come for your abortion appointment.

Can I eat or drink anything beforehand? 

When booking your appointment, please listen carefully to the specific instructions you will be given regarding eating and drinking before your appointment.
For a surgical abortion: Do not drink alcohol, for 24 hours before and 24 hours after treatment. No eating, chewing gum or sucking sweets is allowed for 6 hours prior to treatment. 1 glass of still water can be sipped until 2 hours before treatment.
For a medical abortion: Do not drink alcohol for 24 hrs before the first tablet and until 24 hrs after the second tablet. 

I've got a cough, cold or sore throat. 

It's advisable to rebook your appointment for when you're feeling better. Treatment at Marie Stopes UK is always subject to assessment by a doctor on the day, so you may be refused treatment if you're assessed as not well enough.

I'm bleeding. 

Light spotting or bleeding in the first twelve weeks of pregnancy can be normal as the pregnancy starts to embed into the womb lining. If you have light bleeding, we recommend you still attend your appointment. We'll perform an ultrasound scan before you have treatment to ensure your pregnancy is inside the womb and to confirm the number of weeks pregnant you are. If the bleeding is heavier than your normal period and/or you have significant pain, you should attend an A&E department, an Early Pregnancy Unit, or see your GP urgently. 

I'm in pain. 

Mild, crampy abdominal pain can be normal in early pregnancy as the uterus (womb) starts to grow within the pelvis. If you have mild cramping pain you should still attend your appointment. However, if the pain is persistent and you need to take painkillers, you should see a doctor for a medical assessment.  

I'm concerned I might have an ectopic pregnancy. 

Ectopic pregnancy is difficult to diagnose and often the symptoms can be confusing. If you're experiencing significant abdominal pain and/or bleeding you should see a doctor. Minor abdominal cramps and light bleeding can be normal in early pregnancy. We perform an ultrasound scan on the day of your appointment to confirm your pregnancy is inside the uterus. 

Read our advice on ectopic pregnancy.  


I'm not sure I want to have an abortion. 

At Marie Stopes, we will not proceed with abortion treatment unless you are certain of your decision. We have counsellors that you can speak to on the telephone ahead of your appointment. 

Find out more about our counselling services.  

Need to talk about your options?

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

Call us now on on 0345 300 3737 (callers from Northern Ireland) or 1 800 200 374 (Free phone for callers from the Republic of Ireland) or email services@mariestopes.org.uk