Single mamas out there?

I’m currently 16 weeks pregnant and with my fiancé. We’ve always had a difficult relationship and it only seems to have gotten worse since I’ve been pregnant due to my hormones being out of wack. I’m not sure if our relationship will last or not and if it doesn’t Im wondering how y’all do it? My fiancé is planning to be in the childs life but pretty much everything is primarily going to be up to me. How do y’all work? Who watches the child? Do you live on your own? How do you do it? Thank you in advance.