am I having contractions??

I'm 37weeks 3 days. My back and hips has been hurting really bad, but not to where I'm crying, or in a ton of pain. I can feel my stomach moving but it doesn't hurt in my pelvic area, just in my back. I'm not sure if it's contracting or if he's just being SUPER active. I don't want to sound stupid and go to the ER for nothing, what does everyone think it is??