Im 17 and pregnant and ive been living with my boyfriend and his mom since july 2010?

now my mom is saying i cant because we got into a verbal arguement today and he called her yelling at her saying she wasn't a mom because she abandoned me and she called the cops and he was arrested because he tried to push past them he was only charged with obstruction to an investigation i still want to live with him but she says if i go back she will call the cops and have me removed or call DCF and have my baby taken from me.... i dont know what to do im so confused