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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The contraceptive vaginal ring

The contraceptive vaginal ring is a flexible, transparent ring which is placed inside the vagina for 21 days at a time followed by a 7 day break. In the UK, its brand name is Nuvaring.

How does the vaginal ring work? 

The ring works in a similar way to the combined pill by releasing a daily dose of of oestrogen and progestogen. This prevent the ovaries from releasing an egg each month (ovulation), thickens cervical mucus, and thins the lining of the womb, making it harder for sperm to move through the womb.

Typical use failure rate is up to 9% (up to 9 women in 100 will have an unplanned pregnancy in the first year of use).

Vaginal ring advantages

  • One ring stays in for three weeks.
  • There is no need to thinking about contraception every day, like when taking the pill. 
  • It can make periods regular, lighter and less painful. 
  • Unlike the combined pill, the vaginal ring is not affected by vomiting or diarrhoea.

Things to consider about using the vaginal ring

  • You need to learn how to insert and remove it.
  • It is not suitable for women with high blood pressure.
  • It is not suitable for women over 35 who smoke.
  • It may not be suitable for women who have migraines.
  • Taking some other medications can make it less effective.
  • Side effects include mood swings, breast tenderness, and headaches.
  • There is a low risk of blood clots. 
  • Unlike condoms, it offers no protection against sexually transmitted infections.

How to insert the vaginal ring

With clean hands, squeeze the ring between your thumb and finger and use one hand to insert it into your vagina. If necessary, spread your labia (vaginal lips) with your other hand.

Push the ring into your vagina until it feels comfortable. It does not need to cover your cervix (entrance to the uterus) to work.

If you insert the ring the day after an abortion or on day one of a period, it will start to work straight away. If inserted on any other day, use extra precautions such as condoms, or abstain from sex for seven days.

Find out what to do if your vaginal ring falls out, you forget to remove it at the end of week three, or forget to re-insert a new one after the ring free period.