I've had my period for almost 2 months, non-stop?

alright, i just turned 18 june 30th. and i've had my period since around june 12th. i can't take birth control because i have a high history of blood clotting in my family. i won't take the depo shot because of the risks of bone marrow loss and it usually makes your period more screwed. i'm really afraid this will affect my chances of having a child. please, what is wrong with me?