It is a nightmare bubsworth and it’s normal to waver, minimize, and feel like you were overreacting for reporting the abuse to the police, BUT... Keep reminding yourself that you did it for a (damn good) reason. His behavior will escalate and he’s paving the way to further abusing you by blaming women in general for being hit, like it’s their fault and not the abusers fault!!! Warped bastard!
As he escalates the abuse he will also escalate the mind games to ensure your mental state is so messed up that you can’t leave. I feel you really do need to leave now while you have some strength to do so. There is no reason to wait until things get worse and you feel too messed up to leave.
Please go while your baby is small to minimize the effects he has on her. You have support out there - grab it by the balls and accept all the help you can get. The only things that are important are you and your babies safety, mental health and happiness. Staying for financial reasons or the house etc are irrelevant at this point.
You’re young, you’ve a life ahead of you. Imagine a few months from now where your mental health is stronger, your boundaries are stronger and you’re happier. As opposed to feeling weaker and more anxious, walking on eggshells. Try think of this all as fate - you came on to mumsnet for help soon after he abused you, you rang the police, you have support. You’ve done all the right things to help you and your baby, so Please take that step towards a new life - I’m not saying it’ll be easy but it sounds like staying will be harder in the long run - sending you strength X