How to escape abuser

I'm due to have my baby in the next few weeks. My boyfriend has physically abused me and still verbally abuses me. He'll go on and on for hours saying horrrible things and I just stay silent because if I respond I'm afraid it might turn to physical abuse again. He also won't stop spending money for the baby on marajuana. He has threatened my life if I tired to leave before. Also, we work at the same job. So I'd have to quit my job. I can't afford to live without him and he can't afford to live without me. I also can't afford to run out on my lease and mess up my credit. I could go stay with my dad but he lives in a one bedroom apartment. That would be me, my mom, my dad, and newborn in a one bedroom apaprtment. That's ridiculous. I don't know what to do. I feel like I have no options but to stay and deal with the abuse until I can find a good job and can leave. Even then I'd still be scared that he'd try to hurt me or take my baby away. People always ask why women stay in abusive relationships. Well....