pretty sure it's period cramps, but I don't know. I started my period today, the first day is usually the worst. But the cramps are strange...it feels like a stomach ache does, but under my belly button and on my right lower back. I took a midol and it hasn't worked, that's why i'm afraid it isn't period cramps. It's gotta be period cramps, but why does it also feel like an upset stomach?? ouch!!!!