Opinions pleaseeee

So, I'm 17 and pregnant. I'm 30 weeks, and me and my finance which is the father of course, want to get an apartment. I have enough money to afford to move out, and we'd have a roommate. My mom is saying no, not allowed and she won't let me. She says no to everything which I understand. But I have two jobs, I do everything for myself besides my fiancé of course he's always helping and there for me. How will me and my fiancé care for the baby together and learn together when she is born if we can't be with her together? We'd have to spilt her. She's stay with him half the week then me, because my parents wont let him stay with us for a little and won't let me stay at his house. Idk what to do, it's hurting my feelings. She says I can't do anything or handle anything on my own. Makes me feel like I can't be a good mother or take care of my baby girl. Idk what to do, and I can't stay with my mom anymore she just always fights with me or says how I do nothing right. She doesn't do anything for me anymore, I just literally sleep here.. so it doesn't make sense to as why she is saying no.