Yes. Happens to me. Some of my periods are pretty easy and some are really heavy and crampy and I feel like I can't do anything. I've been told it's just my body trying to figure itself out again, which can take up to a year or so, I believe.

Are you on birth control? I was on the pill and that made it light, but cramp really bad. And then I decided I didn't want birth control anymore about two months ago and now my periods are heavier again, but not too bad.