I'm so sorry you're going through this 
Please realise you don't need to.
I know how scary just pregnancy, especially unplanned, can be. With all this added in, it might look bleak while you're in the situation, but from the outside looking in it can look different sometimes.
You think there's no way out if you have this baby, a baby you seem to want otherwise, but there is. There are organisations specifically for people in your kind of situation. You don't need to do it alone, these people want to help.
www.womensaid.org.uk
Or you can try to Google "domestic abuse" or similar, followed by your postcode.
You know abuse isn't always physical violence, it can be financial or mental/emotional too. All are equally bad.
You sound really nice, you and your baby don't deserve this. Even if you weren't pregnant, there would still be ways out and you still wouldn't deserve this.
If you want him to see your child, he can, he doesn't need you there for that and you never need to even see him. If you think he will be damaging to your child there are things you can do there too usually.
How far are you, have you arranged a booking in appointment? At the booking in appointment, they will ask you about abuse. So think about if you want him there or not.
You don't need to stay with him. He has not "trapped" you now with this pregnancy. You still have time to leave before you get heavily pregnant.