Am I in labor?! Help?

I went to bed with period-like cramps every 20-30 minutes. I fell asleep but then woke up at 4:00 am with contractions every 15-20 minutes. Some were irregular. Now I am having pain in my back that shoots to my front and hips every 10-15 minutes. The last three hurt really bad. They all last about 1-3 minutes. Could I be in labor or could it just be gas pain or false labor?