Which doctor should I call?

For the past week I've been having terrible shoulder pain. I think I might possibly have a rotator cuff tear. I think I hurt it at work. I cant lift my arm over chest level, my arm is real weak and it's hard to lift things, the pain is really bad at night, and the pain keeps getting worse everyday. I'm only 6 weeks pregnant. Should I just call my regular family doctor about this, or should I call my ob doctor? Also any advice on what to do for the pain?