I had my first period when I was 16. I had maybe three periods over the next year (very light) ran track and cross country, and I knew that it was normal for athletes to have very light periods or none at all, so I didn't think too much of it. I stopped running soon after that due to injury. It's been almost two years and I had heavy irregular periods at first (maybe three), but it's been about a year since my last one. Is something wrong?