Had unprotected sex last week and the week be for the 31st and the 7th start bleeding the 5th light then dark then light now its dark brown am i pregn?

See a Doctor: It's possible that unprotected sex may make you pregnant. We don't know when is your menstrual cycle due, is it regular ? But the brown discharge is abnormal . Best to see a doctor to get a good history and exam.

Possible pregnancy: The only way to assure you of not being pregnant is for you to get pregnancy test done. If negative, then you're not pregnant. Otherwise, you are.