I feel miserable!

I've been cramping for about 3 days now. Mostly a tugging feeling, really. Today it has felt a little different, and AF was supposed to be here the 12th. I don't record periods the way I should, but it's normally pretty spot on. I feel sick, my back and lower abdomen hurt, along with my head. Hoping it isn't AF showing her ugly face! Anyone else in the same boat?