Pelvic pain

I'll be 31 weeks Wednesday and I have this horrible pelvic pain. Its been going on for the past month at least, maybe longer. It feels like it's my pelvic bones. I can't walk, lay down, roll over, bend over, sit down, or get up without it hurting me really bad. They are constantly hurting though even with me not doing anything. I haven't been able to have sex in awhile because I'm in to much pain. Is there anything I can do to help with the pain? I have a doctor's appointment Wednesday, is it even worth me mentioning? Can they do anything? This is my second pregnancy and I don't remember being in this much pain with my first and she's 2.