I had sex with my boyfriend while I was ovulating (I think that's the right word, for when your most fertile on the days before your period) and I got my period the next day, it only lasted two or three days. 3 1\2 weeks after having sex I got what at first seemed like a period but was much heavier and more painful and the pain was more centered around my pelvic area where as on a normal period it would be total body aches and pains. There was lots of heavy bleeding to the point where I has to wear tampons and pads together and there was lots of small clotting and then a large clot, about one inch long, after a large clot I continued with heavy bleeding and it slowly stopped bleeding but the pains continued. The 'period' all together lasted about two weeks, and now its three days after it stopped I'm still having minor pains. I haven't told my boyfriend or my parents cause I don't want to freak them out if its nothing. But I'm starting to think something's wrong...