If it has been three weeks since you had unprotected sex or if your period is late then I would recommended taking a pregnancy test to see if you are pregnant. If it comes back negative wait 4 days and retest. You can get tests for free from your GP or local contraceptive and sexual health clinic (you can find your nearest one here fpa.org.uk/find-a-clinic ). Although you can also buy them from pharmacies, supermarkets and even pound shops.
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