I am 19 years old. No previous pregnancies, miscarriages, or abortions. I haven't had a period in 6 months (my periods are not ever normal). I have tried several birth controls to regulate my period none of which worked like they should. Some made it more regular, but caused terrible cramps, or depression. Others just didn't do anything. I've been off for about a year now maybe a little more. I have not had a period in 6 months. Now I have been cramping for 3 weeks, and they only get worse. Yesterday I started spotting lightly. But I am not pregnant. What could be wrong?