my boyfriend and i had sex a few days ago, and yesterday i thought i was getting my period like normal but it only lasted for a few hours, because today it's gone. I should say that i am usually regular but this month my body has been acting a lil crazy: a few days (around 4ish days) before we had sex i started spotting which was unusual for me, even during ovulation, cus ive never spotted before. by the time we had sex, i was still slightly spotting, but it was brown mixed with my discharge so it was old blood. Why is this happening?