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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Pubic lice

Pubic lice are also called phthirus pubis. They are tiny parasitic insects that live on coarse human body hair, like pubic hair. They are often called ‘crabs’ due to their crab-like appearance under a microscope.

How do I get pubic lice?

Pubic lice can be spread through sexual activity, direct skin-skin contact, and contact with an infected person’s towels, bed linen and underwear.

How do I know if I have pubic lice?

Some people are not aware they have pubic lice as they have mild symptoms or no symptoms. If you do have pubic lice, you may have:

  • Itching in your pubic area
  • Visible lice or eggs
  • A fine, black, gritty debris on your underwear

Pubic lice can be diagnosed by careful inspection of the affected area, and the doctors at Marie Stopes can examine for this if you wish.

How do I get treated for pubic lice?

  • We can prescribe topical insecticide shampoos and lotions, and you do not need to shave your pubic hair. The treatment should be re-applied in a week to kill any newly hatched lice.
  • You need to thoroughly machine wash your bed linen, towels and clothing and sterilise with detergent and hot water to ensure the infestation does not spread.

How can I prevent myself from getting pubic lice?

Pubic lice are not linked to poor personal hygiene. They are spread through close body contact with someone who has them. Condoms will not prevent them being passed to another person. Ensuring your sexual partners have STI screens is one way of preventing pubic lice from being transferred.