Leaving an unhealthy relationship pregnant

Hi, I have asked for advice or just kinda shared many times on my toxic relationship with my fiancé who I’m now 11 weeks pregnant with our baby. I have a 3 year old from a previous relationship. I’ve given up everything to be with this man. Done everything I can cried, pleaded done therapy. Given up jobs, nursing school etc. it’s taken everything from me. I’m still very much in love with him. Which in itself is an issue for me to look at. I’m terrified to leave because I’m so worried that I didn’t do enough and I know what this is like the pain that comes with coparenting and I’m only 11 weeks pregnant. I have so much time to go through postpartum and transitioning from not fully being a single mom to being a single mom of 2. I’m worried about all the pain I’m going to face. The statistics of children who grow up with single mothers. The immense hole in my heart I feel. Because I tried so hard. I had a rough childhood. My first child’s dad cheated on me and is now with one of women he cheated on me with and I have to share custody and holidays with those people who took away my peace and being loved and cared for as a mother. I’m so scared to do this alone. My fiancé hasn’t left me but has made some demands I don’t think are healthy like making me quit my job that I’ve had for 5 years at a great hospital and cut off my mother who has helped me a lot with my oldest. He’s also told me he doesn’t know if he loves me anymore. He and I both wanted to have a baby and it’s drastically changed. I haven’t spoken to him in almost a week. But he wanted to speak Friday. I don’t know if that means he’s going to break up with me or what. We’ve been together almost 2 years. I don’t know what to do. I know I should leave where not wanted but I don’t know how to gain the strength. How do women do this alone? Please help if you have any advice. I’d appreciate it.