Hi i had unprotected sex with my boyfriend the night before i started my period and my period and 2 days later im bleedin again what could be wrong?

Irregular bleeding: You aren't describing anything worrisome - your symptoms of bleeding off and on before/after your period are very common.See your doctor if pain, tenderness or fever or painful urination develop.

Hormones: Or maybe you just did not completely finish your period in the first place. See how long it goes on , and try some advil or aleve (naproxen) if you need it!