I'm being abused..

I am 14 weeks pregnant.. Been with my boyfriend for over a year now. We have that great story of 2 people who see each other and instantly fall in love. None of the abuse ever happened until the last couple months... We've always drank together and it's never been a big deal, nothing bad has happened before. But since getting pregnant I've stayed completely sober.. And of course he's continued to drink. It wasn't bad at first until we started fighting.. He would run away to a bar then come home blazing drunk and scream at me.. And it's just gotten worse... He steals my phone so I can't call the cops, I've been held down with a knife in his hands, I've been thrown on the floor, I've been slapped, I've had my head bashed into a door, I've even tried running outside to the neighbors in nothing but a t shirts in the freezing snow to only have him come chasing after me dragging me back into the house. I'm not saying any of this for attention or pity.. He's the best man in the world when he's sober.. When he's sober he would do anything for me and the baby.. But when he's drunk and mad at me there is no controlling him... He's not himself anymore and the alcohol takes over.. I haven't said anything to my family because I don't want to worry them. We just moved to this city 6 months ago and I have no one here and family is 7 hours away.. I just don't know what to do.. Or where to go.. I just wish he would stay sober and be the man I know he can be...