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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How will I know my vasectomy has worked?

If you have a vasectomy at Marie Stopes UK, we will carry out a semen test after your procedure to ensure that the vasectomy has been successful.

Semen testing after 16 weeks

You will be given two sample kits on the day of your treatment to take home as well as exact dates to take and send in the samples. We will test the ejaculate 16 weeks after the procedure to ensure there's no longer sperm in it. 

Read our advice on how to use your vasectomy testing kit.

Contraception needed untill you get the 'all clear' 

You will need to use other contraceptive methods until you have received the all-clear from Marie Stopes UK, otherwise your partner may become pregnant.

Need to talk about your options with Marie Stopes UK?

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 0345 122 1441 or email services@mariestopes.org.uk.