Having a baby ruined relationship with SO?

This is my first pregnancy and I feel like my SO has become a total a** ever since we found out. He thinks I'm lying about being sick, tells me to get a job when I can't even go pee without vomiting, and tries to pressure me into having sex with him when I don't feel good. I'm starting to second guess if I even want to be with him. I do not want to deal with custody drama though because I want my baby with me 24/7. What do I do?