Every time I move I contract

I’m laying in bed and I contract every time I move. I got up and walked around and once I stood still I contradicted some more. I’m not dehydrated I drink water literally all day from morning to before I go to bed. What could cause this? It’s painful to where I can’t move and my body goes stiff but I can still talk through them but have to breath heavy

36+4 days been 2cm 75% effaced since 34 weeks.