Contractions

FTM here currently 35w 5d and I've been having really bad pains that start in my lower uterus and shoot around to my back. It feels like muscle spasms almost. I'm pretty sure I'm not in labor cause they go away when I rest but if I'm on my feet for more than 10 minutes I get them every few minutes and they make me bend over in pain and take my breath away. Are these contractions or not?? And does it sound like normal pains or should I call my dr first thing in the morning??