Okay guys... This is a little all over the place, so bear with me. When I was 13 I had a period that lasted 5 months. Extremely heavy bleeding, non stop. Then i got put on birth control and it regulated. I got the guardasil shot when I was 13/14, and my period went away. When I was 15 I started taking the depo shot, and my period would happen every 3 months or so. When I was 16 I got addicted to heroin, and my period stopped all together. During bouts of sobriety (11 months when I was 18), I would have bleeding or spotting here and there. And now, I am 20, when I recently had 2 months clean (completely) I spotted for four days, and now I have 9 months, and haven't had any bleeding since then. I have unprotected sex regularly and have never gotten pregnant, there was even a point where I was trying. Does anyone else have a similar experience? I know the drugs can really effect it, but I just don't understand.