So my boyfriend and I had protected sex about two months ago, and later that month I had a super SUPER heavy period, with cramps in all. But then last month I didn't have one at all? We haven't had sex, or anything at all since...I know that if you have a heavy period, you cannot be pregnant in anyway, shape,or form, so why didn't I have one last month? Mind that my periods are super irregular! I do recall once a few years ago before I was ever sexually active I went entire month w/o a period, but then around the first day of the next month I had one. It's going on the third, and no period? What's happening? I'm sure I'm not pregnant, but why haven't I had a period?!