My OBGY-N put me on birth control for my Poly Cystic Ovary Syndrome (I hadn't been having regular periods). It's only been a week since I've started the pills, and I've already started a period (which I didn't think was supposed to happen until after the third week).I've had to change my tampon every 1-2 hours and there are chunks of the uterine lining in my pads which is like a usual period. Is this normal or is something wrong? (This heavy bleeding has been happening for 5 days now).