Pregnant girlfriend trying to take daughter away from me?

My ex-girlfriend is about 6 months pregnant.. we were fine and everything until this last spring break. She gets a new best friend (female) and she asks my ex if she will go to PC with her and 4 other guys.. I had plans for us to be together on spring break and she says shes going to PC.. and completely leaves me. I find out she goes to one of the guys house with her friend one day and completely lies to me and Im enraged I call yelling and stuff and she breaks up with me calling me psycho? She now says shes goin to try to keep me out of my daughters life and I might as well give up. She has been in drunk driving accidents, been caught in the same car with weed, pretty much got kicked out of one high school because she took pills and had with 3 guys the same much and started a bunch of drama... I got with her because I thought she had changed for the good and everything was good until this spring break and its been downhill our families hate each other we hate each other.. my question ism since I have never been arrested or anything like that (except for a speeding ticket) will she actually be able to keep my daughter out of my life? I know she wont be a good mother and I just want to save my daughter but I know theres no way I can just take her away from her mother and I have college starting soon.