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 IUD (copper coil)

The IUD or copper coil is a small plastic and copper device that is fitted into the uterus through the cervix using a simple procedure that takes a few minutes. It stops sperm meeting an egg or it may stop an egg implanting in the uterus.

The IUD is a long-acting reversible contraceptive (or LARC). These types of contraception are recommended by Marie Stopes United Kingdom, as they are over 99% effective – they’ve been shown to be 20 times more effective than short-term contraceptive methods such as the pill, patch or vaginal ring.

Long-acting methods of contraception all have the advantage that, once in place, you don’t need to think about them until they need replacing. None of them interrupt sex.

IUD advantages

  • It can last up to 10 years.
  • Useful for women who want to use a method that is hormone-free.
  • Works as soon as it's put in.
  • Fertility returns immediately after it’s removed.

Things to consider

  • Unlike condoms, it does not protect from sexually transmitted infections.
  • It requires a simple, small procedure to fit and remove.
  • There may be some abdominal pain for a few days as the IUD settles.
  • You will need to see your GP or family planning clinic 6 weeks after fitting for a coil check.
  • Periods can change with the IUD. They are likely to occur at the same time as your usual period but may be heavier, longer and more painful. This is normal and the IUD will still be effective.

IUD aftercare advice

If you have an IUD fitted, it will work straight away. Please see your GP or attend your family planning/sexual health clinic after 6 weeks to have your IUD checked.

Once a month, after your period, gently insert a finger into your vagina during a bath or shower. The neck of your womb (cervix) feels a bit like the end of your nose, and you should be able to feel the threads of your IUD. If you can’t, please see your GP or attend your family planning/sexual health clinic and use condoms or abstain from sex until the presence of the IUD is confirmed.

Your partner should not be able to feel the threads during sex. If this happens, seek advice as above, as your threads might be too long.

You can have this contraceptive fitted after Marie Stopes UK abortion treatment. Marie Stopes UK will only offer removal for medical complications.