I’m hurting

Okay I am 15 weeks pregnant a couple of days ago I start to spot brown stuff which I say is old blood. I’ve been hurting so bad to the point where I can’t walk. It feels like my baby will fall out at any moment when I’m walking there is soooo much pressure and pain. I cry just to go to the rest room. I went to the dr and all they are saying is ligament pains. I said okay understandable but it’s getting worse where I’ve been calling in because it hurts to get out bed. They didn’t do a ultrasound on me they just predicted what they thought! Should I be concerned? Should I look for a better doctor? What should I do? Is this normal? And yes before you ask I’ve tried Tylenol,warm baths and heating pads.