Help!!

Brittany
I'm 31 weeks today. The other night I got woken up out of a dead sleep having contractions. It was only 3 and 1 of them was about a minute long. They were pretty strong. I've been having really mild ones as of recently, but it feels more like a dull menstral cramp and pressure. 
Does this sound like normal Braxton Hicks or should I be concerned? 
My next doctors appointment is only a week away so I wanted to get some advice to see if it was really worth calling about before hand.