Run now! It gets so much harder when the baby's born. Abuse and mental illness are two completely different things. Please run, it'll only end bad if not. I've seen really bad situation with people allowing abuse or psychosis happen after children have been born.

Okay if you plan to stay you need to tell your OBGYN that you're being abused because you are classified as high risk due to the stress and emotional issues that come with abuse. Please see a therapist to help you through all this. You can even tell your boyfriend that the clinic that you go to requires for mid pregnancy to the child's 1st birthday as a precaution for post partum depression.