I had unprotected sex but took an ipill within 24 hours of it. I was ovulating at the time but he didn't ejaculate inside me. I got my periods on the estimated time, ie, 4th may. This is about two weeks after I had sex. On the first day of period I had unprotected sex again. This time also he didn't ejaculate inside me and I bled a lot that night. Suddenly my period kind of stopped on the 3rd day but resumed on the 4th day although it wasn't heavy. And altho im done with my period I have been experiencing brown small patches on my underwear. Could I be pregnant? Are there any chances that it wasn't a period but implantation bleeding? Im kind of worried please help.