I am so sorry to hear about your situation. I was in a similar situation a few years ago, except I wasn't pregnant. I had been in an accident and was disabled and until I had surgery (which was about a year after the accident) I could do anything. It was frustrating for me but even more frustrating that instead of being there to help me my (now) ex-husband got very abusive. I did end up leaving, but I really wish I'd left a lot sooner than I did.
It's really hard, but once you do it you feel so free! I remember driving down the road with my dog and whatever I could fit in my car just singing at the top of my lungs and dancing around my car. I'd struggled with the decision to leave for over a year and to finally make it was great. Trust me, things will not get better anytime soon. Leave now! Get your freedom back!
If you don't have any friends or family nearby check out a shelter near you. They are fantastic. I ended up just driving home across country when I left but if driving home isn't an option or you don't feel safe going there the shelter is the best place for you. They will help you get clothes, get legal advice, medical help, therapy, and police protection if you need it. You'll meet other women who are in the same boat you are which will really help you feel less alone.
Good luck to you! *hugs*!