First time

I first got my period when I was 12 or 13. Been normal and regular up until the month before I lost my virginity (October 2009) when I completely skipped a month and then I was normal and regular again. When I started trying to conceive my period started getting all out of whack. It's late or heavy and this is my first month where it's about to go over 7 days. It was 5 days in December. I've been TTC for 15 months. I don't really believe in birth control. Hear way to much horror stories about it. And this period is the first extremely light period I've ever had :( I'm not sure what's going on