Im stuck

I don’t know what to do. I married my husband almost 3 years ago, when I got with him I knew he had two children with two different people. He had his first daughter when he was 16/17 he was never there for her. He then got with someone else and had another daughter he was there for almost 2 years then the slit because her mother had a other baby that wasn’t his. The mother of his second daughter took the daughter away from him once him and I started dating.

Fast forward to now, we have a 13 month old and we just found out were expecting another baby. This past weekend we hung out with his first daughter. Everything went well expect some parts, which I didn’t like. Putting all of that aside now he is talking about her moving in. I don’t know but that is just moving too fast for me. I can’t imagine having a 13 month old, a new born and now his 8 year old daughter. It is too much. It’s putting to much stress on me and giving me way too much anxiety. I’m worried now for the health of my unborn child due to the amount of stress.

I don’t know what to do. I need advice. I have no problem with him spending time with her but her moving in I do. Because my house works long hours he barely helps me out with our daughter now. His excuse is he work, but I’m going to start working as well.