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The progestogen only pill (POP) contains the hormone progestogen which is similar to the hormone women naturally produce.
It works by stopping the ovaries from releasing an egg each month (ovulation). It also thickens the mucus in the cervix preventing sperm reaching the egg and thins the lining of the uterus so it is less likely to accept a fertilised egg.
You can get the progestogen only pill from your GP or local sexual health clinic