My hips and back keep locking up!!

This is my third pregnancy, both pregnancy before were hard on me, but I was hit by a cemi truck and my car was totalled 2 months after my 2ND baby was born, it messed my back up and my hips and a few other places, I'm now 15 weeks with my 3rd and last child, but I can't even get out of bed for my hips locking up and my back and the pain is getting worse, what should I do? Is this normal?