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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STI Facts: Chlamydia

Chlamydia is one of the most common sexually transmitted infections (STIs) in the UK. It is caused by the bacteria Chlamydia trachomatis and can be serious for both men and women. Chlamydia mainly infects the penis, cervix, anus and throat. Chlamydia infects 1 in 10 under 25-year-olds, so the only way to be sure you don't have it is to get tested.

How do you get chlamydia?

Chlamydia is passed on by unprotected sex with an infected person. This includes vaginal, oral and anal sex. This can cause serious lung and eye infections. If you have chlamydia, it is also easier to catch and pass on HIV.

How do I know if I have chlamydia?

Most people with chlamydia have no symptoms; they only find out when they are tested. 70% of women and 50% of men with chlamydia are asymptomatic.

Chlamydia symptoms in men

For those men who have symptoms, these include:

  • Unusual discharge from the penis
  • Burning or pain when urinating
  • Irritation or soreness around the opening of the penis (the urethra)

Getting tested for chlamydia

A urine test or swab can easily determine whether or not you have chlamydia. Anyone can get free and confidential chlamydia test at a sexual health clinic, a GUM (genitourinary medicine) clinic or a GP surgery.  

How do I get treated for chlamydia?

Chamydia is easily treated with antibiotics. The antibiotic can be given as a single dose, or as a course over a week to ten days. It is important that sexual partners are tested and treated as well.

What would happen if I did not get treated for chlamydia?

If men remain untreated they can develop infection and swelling of the prostate gland (prostatitis), swelling in the testicles (epidiymitis) and infertility.

How can I protect myself from getting chlamydia?

Anyone who has sex is at risk of getting STIs including chlamydia. At Marie Stopes, we recommend:

  • Always use condoms or dams and a water-based lubricant when having sex, even oral sex.
  • If in a long term relationship, ensure each partner has been tested before stopping condom use, and that neither of you has other partners.
  • Have regular STI checks.
  • Discuss STIs with your partner, even when it is difficult to talk about. Your partner will appreciate your honesty and that you don’t want to infect him/her. You have the right to know if they are infected too.