Visitation and custody of unborn with unfit?

I posted on here before and got a lot of great responses. I was in a relationship, moved out at 7 months pregnant becuase of physical abuse. Because of having to go to the hospital from the abuse which was reported he is being charged with three felonies. One being child endangerment. Its a horrible situation as I think no person would want to go through this let alone a pregnant woman. I am worried about the visitation when my child comes out that the father is requesting. I don't see how anyone could do such a thing being that I am pregnant with his child yet it makes me think gosh what jeopardy could you put your child in when she is here. Its hard and hurtful but I am willing to go through this alone and am fully capable of this. The charges are in the DA's hands at this point and he has asked me to write a letter saying it didn't happen to save his . But I am not a liar and what make myself look like some idiot when I decided no it was wrong and don't need this bull ****!! My question is what are the chances of him getting some kind of custody or visitation rights having spousal abuse, child endagerment possible death injury and threat terrorism charges due to that night. I don't want to ruin anyones life but being a mother I feel as if it is defineltly my responsibility to no longer put my child in that situation. And I wont!!! And now I am the mean one right? Being pregnant hormonal and emotional is making this all the harder but its reality just need some kind of advice. I don't even know how to proceed. He would like to take it to trial which therefore I don't know if I have to testify which would make it all the worse. How do you do that to someone you love. Obviously I did love him enough to have his child but how did he love me to do that stuff and now of course is sorry and wants to change? Just really confusing. Advice on any steps I should take and what the courts will allow in California. Thanks