Beat but why am I so scared to tell

Last night my bf beat the crap out of me and I was scared for my life! So I ran out and called my best friend to come get me. I don’t know what to do. I’ve hid this for so long I’m scared to tell anyone! I’m so scared to call the cops on him . Idk what to do. Why am I thinking like this?? I’m 4 1/2 months pregnant by him and he has literally beat me throughout my pregnancy. Somebody please help me understand why my mind is thinking this way