Hitting a pregnant woman....

Is it against the law? I was at my baby daddy's house today (I'm not calling him that again because he doesn't deserve that name) but his girlfriend (who he said was his ex) showed up and her and her friend started hitting me. He didn't do anything which is why he's out of me and my child's life. But they didn't hurt me that bad just my lip hurts a little. But now they're cousin is saying she wants to fight me also I never even met this girl or had anything to do with her but if she tries to can I press charges because I'm pregnant or can I press charges for what happened today?