I've had my period for 3 weeks straight, heavy, blod clots and all. I'm 16 years old and have had my period since I was around 11. It was regular, only lasting up to 3 days until this past summer. I once got it for 3+ weeks like I'm experiencing right now. The only thing is, the next following months I did not get my period. I'm just wondering if someone can help me out because I think it is getting really serious. Thank you.