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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I've had unprotected sex, what can I do?

Having unprotected sex puts you at risk of a sexually transmitted infection (STI) and unplanned pregnancy.

At Marie Stopes we can help you through this time, test you for STIs and organise emergency contraception for you.

Please contact our 24-hour booking service and see our sexual health screening fees for more details.

Emergency contraception

Emergency contraception can be used to reduce the risk of pregnancy when no contraception has been used during sex, contraception may have failed (e.g. missed pills, condom breakage) or sexual assault has occurred. At Marie Stopes we offer two types of emergency contraception.

The emergency contraceptive pill

This is also known as the 'morning after pill’. Ella-One is offered at Marie Stopes and can be used up to 5 days (120 hours) after unprotected sex. 

How does the morning after pill work?

It acts on progesterone receptors and acts to delay ovulation. It also causes some changes to the lining to the womb, which may also act to reduce the chance of unplanned pregnancy. It's not the same as the abortion pill as it acts to prevent pregnancy, not terminate an existing pregnancy.

How effective is the ‘morning after pill’ at preventing a pregnancy?

It has been shown to prevent up to 85% of unwanted pregnancies and is more effective taken closer to the time of unprotected sex. 

Will I have side effects from the ‘morning after pill’?

There have been no reported major side effects reported in women who have taken the morning after pill. The most commonly reported side effects are minor abdominal pain and cramps, as well as some irregular vaginal bleeding. You may experience your period a little earlier or later than usual. If your period is late by more than a few days, you'll need to do a pregnancy test. The morning after pill is not recommended for use in pregnancy, but in the small number of people who have become pregnant despite taking the morning after pill, there is no evidence to date to say that it has damaged the pregnancy.

Will the ‘morning after pill’ interact with my other medications? 

The morning after pill may be made less effective by medications including St. John’s wort and those used for epilepsy. Before taking the pill you should discuss you medications with a health care provider, or a doctor at a Marie Stopes Health Screening Clinic.

The intrauterine device (IUD)

An IUD is a small T-shaped plastic and copper device that’s inserted into your womb (uterus) by a specially trained doctor or nurse. The IUD may be appropriate if it is less than 5 days since you had unprotected sex. It's the most reliable form of emergency contraception, and may be appropriate if you are planning to use an IUD for future contraception. 

We can arrange for you to have an IUD fitted at our health-screening clinic as an emergency appointment. 

How does an IUD work?

The IUD works by stopping the sperm and egg from surviving in the womb or fallopian tubes. It may also prevent a fertilised egg from implanting in the womb. The IUD is a long-acting reversible contraceptive (LARC) method. This means that once it's in place, you don't have to think about it each day or each time you have sex. 

You can use an IUD whether or not you've had children.  

How effective is an IUD as an emergency contraceptive?

An IUD is the most effective form of emergency contraceptive. If inserted within 5 days of unprotected sex, it can prevent up to 99.9% of unplanned pregnancy. It'S also an effective long acting reversible contraceptive and can be left in for 5 or 10 years depending on which type is used.

Will it hurt to have an IUD put in?

An experienced sexual health doctor will fit your IUD if you choose to have it inserted at Marie Stopes for emergency contraception. A female doctor will be available to answer any questions and discuss your procedure, the risks and benefits. After your discussion, you will be asked to remove your lower garments and lie on a gynaecological bed. Sometimes we ask for you to put your legs in stirrups as this makes the procedure quicker and easier. 

We will examine you first to assess the size of your uterus and where your cervix is. We will then place a speculum in the vagina so we can see your cervix. We will place a local anaesthetic gel on your cervix and clean the area. We then grasp your cervix with a special instrument, measure the length of the uterus and put in the IUD. During this part of the procedure, you may experience some discomfort, like a menstrual cramp. Most women tolerate the procedure well and have no issues. If at any stage you are uncomfortable, advise the doctor, so they can ensure you are managing. The procedure is simple and takes less than 10 minutes.

Are there risks to having an IUD inserted?

There are no clinical procedures that are risk free. There is a small risk of infection, and if you have not had swabs done, we may give you antibiotics at the time of the procedure to minimise this. There is a small risk of a perforation of the uterus and for this reason, we ask you to feel for the IUD strings to ensure the IUD is in place. There is a small increased risk of an ectopic pregnancy when an IUD is in placed. 

Some women find they have some menstrual cramping and spotting after an IUD is inserted. This usually settles in 24-48 hours but if it persists you can contact our 24-hour advice line.

The IUD is the most effective non-hormonal contraceptive available. Some women say they have slightly heavier periods with a copper IUD in place. Most women find it an easy and reliable contraceptive and like the fact that it has no hormonal side effects. If you have not had a period within four weeks of having your IUD inserted for emergency contraception, you will need to do a pregnancy test. If you have any issues after your IUD is inserted please contact our 24-hour advice line.

Emergency appointments

We offer emergency appointments for those who would like to speak with a doctor. If you call 0845 300 0460 and explain you need emergency contraception, we can arrange an urgent appointment for you.

  • Contraceptive consultation: £64
  • Emergency contraceptive pill: £32
  • IUD insertion: £106