Just learned pregnant but I'm troubled

I just learned that my prenancy test is positive. I should be happy but instead I want to cry. This is going to be my third child and my hu*****and is very abusive. He used to be very violent physically but after the police took him in when he yelled at the police, he learned he will be in trouble if he does that again in America. But he's still verbally abusive. Three months ago he almost broke my thumb and the ER doctor called police. I had to lie to them so he wouldn't be prosecuted. Today just because I didn't make dinner ready when he got home he yelled at me. I work fulltime and I am the main bread earner at home. I had to pick up both children this afternoon after work. I had to run a couple of errands such as picking up kindergarten registration paper work and ran two trips to pick up my older son since he didn't tell me he had an activity today. Then I had to talk to the doctor's office regarding my test and make appointments. Still I tried to wash and cut the vegetables. I made meat dish on weekends already and it only needs to be warmed up.

I really can't see why he became angry. I know he doesn't want to be responsible for this new baby. He was talking about going to China to do some business. He's always a big talker. How I wish he could leave us alone and go back to China. We talked about divorce several times. I even have my paperwork ready in a legal aid office(I paid them to do it last time we had a fight and he agreed to get $50,000 from me and let me have custody of the two children. He's a big loser. Worked in many restaurants but couldnt' stay long because of his personality. Finally went to school and get a Master's degree while staying at home all day. Now he's saying he has been sacraficing for me for ten years.

He's such a big liar. When I was came to US I worked at three different jobs at school to support myself. I got a fulltime job after one year and have been working since. I've been paying for the house and he wants me to sell the house so he can get half of it. He's a heartless person. He doesn't care about our 14 year old and 4 year old children at all.

Now I just feel so regretful of this pregnancy. I know a baby is a blessing from God but having a baby with this kind of hu*****and and father really disappoints me. What should I do? Should I go and ask the doctor to terminate this pregnancey? I hate doing that but thinking of letting another fragile life suffer with him is a big crime for me.

What should I do?