Period type cramps? 31 weeks + 2

Haley • Haley. Have a beautiful son born on Nov. 30th 2017

I've been getting these tight cramps in my lower stomach and my back and it feels what I get around period time. It stops me from whatever I'm doing but I just breathe it out. I got a sharp pain when I was sitting down and leaning over earlier but idk if I was smushing him or something. Its just all the past few days I've had weird pains