18.5 Weeks with Twins ... feeling Pain

Okay guys I’m currently 18+ weeks, and I moved with my sister a month ago and I been sleeping on her old couch and it’s so hard it feels like a cement floor . Well now, i get pains down there to where I can barely move, my bones pop everytime I move, I have to walk very slow because I be sore, at times when I go to the rest room to pee, I have a sharp pain. It’s like I really be sore and hurting . I even tried sleeping sitting up. I don’t have no leakage or blood though. I’ll be going back home soon so what should I do ?