I began having periods when I was about 12. They were pretty regular until I was 18 and joined the Army. While I was in Basic I didn't have a single period, which I have been told is fairly normal because of the physical exertion. Afterward I didn't begin having them again until about 6 months later and now, 2 years later, they are still very irregular and often extremely heavy. I soaked through an entire night time pad, even staining my pants, in 2 and a half hours. Is this normal or could something be wrong?