p.s. I am so sorry you are going through this with a pregnancy to consider and be prepared for.
I had an abusive partner, the first eight months were just a primer for what was to come. I actually married my abuser and he got much worse once we were married (like your is likely to once you have his child).

I felt so weak in the relationship and didn't think I had the strength to leave. But, wow, did I have more energy once I wasn't dealing with his b.s. day in and day out!!!