How to tell my mom and family I’m pregnant at 16

So me and mom have never gotten along and she’s already told me if I got pregnant she’d make me get a abortion and disown me. Well, I got pregnant and I’m keeping the baby. I’ve already found someone that I trust 100% who has one of her own and a stable place to live and income who will take the baby intel I finish high school. My father will also probably disown me but he’s never been around. I don’t really know what to do or how to tell them. I’m 5 weeks pregnant rn so I have some time before I have to tell them