BF problems!!! I'm lost and dunno what to do?

So i'm 20 and i am 6 weeks pregnant. I am in a serious relatioship and all. However my bf is not being the person he once use to be. Even before i got pregnant he has been treating me like this. He has been treating me like i dont exist anymore. Hes saying im a ***** when i talk to him when im not. He calls me names! Theres so much it saddens me everyday. I come second to him now. I try to talk about mature stuff like how excited i am to spend my life with him and how he feels and all he does is yell at me. He calls me a stubborn bat! Whatever that means. I just want a happy life with a man who treats me with love and respect.