I had unprotected sex with my boyfriend on the 11th, 15th, and 16th of March. Then on the 17th of march, i was supposed to start my period, but instead it was a thick brown discharge that started light then became heavy, and that continued for 3 days. then it switched to a normal red period for 4 more days. the day after my period was supposed to end i had unprotected sex with my boyfriend again, but during sex i started heavily bleeding. the heavy bleeding continued for 3-6 hours then stopped. since the last time i had unprotected sex with my boyfriend, i've had very small amounts of brown discharge that goes away more each day. I usually have regular periods, and the brown to red one lasted about the same time a normal period would, but brown dicharge usually doesn't happen at the beginning of a period for me. if i was pregant i wouldn't have had a heavy red period for 4-5 days, would i? Was i just having a weird period? could i be pregant? could i have an STD? could it be an infection? I really need some answers and nothing on the internet fits what's happening to me. Can anyone help? Pease?