That’s totally normal and most likely related to hormones. I would still be open with him and let him know you’re not happy in the relationship and talk about what needs to change. When I was pregnant with my last baby I didn’t like my husband at all, I had feelings of regret for marring him and having a kid. deep down I knew it was irrational because he’s a wonderful man but I couldn’t change how I felt. I’ve loved raising our daughter together so far and I’m so grateful to have him as a husband now. This pregnancy hasn’t brought so many of those feelings but I still don’t feel very cuddly or romantic and sometimes I feel a little resentment but not as much as last time.
Since your not married by law you have 100% custody of that baby and unless he has a way to prove that you are and unfit mother there isnt anything he can do about it, i dont suggest you keep the baby from him, hope this helps