I feel the same way and I'm 38 weeks today. I don't think I'm having contractions but it hurts so bad to walk around or get up from bed. I've read its SPD. I think if its labor wed be in extreme pain. Have you tried timing the contractions. Fersure if they are 5 mins apart you should get checked. But I think for now what I'm going through at least I think its just our bodies preparing for labor
I would call ur doc and tell them What's going on they might have u go to the hospital or come to the office to check ur cervix