I don't get moms who get mad when their daughters have children, granted you may live with her but your creating life and not only that but life related to her. My mother is thrilled and get more excited by the day, I'm on my second child and although I don't live with her, any time I have an issue with my hubby she jumps to offer me a place to stay at her apartment. But you don't need your momma bringing you down if you straight up know she will be salty that your pregnant, I'd move out then inform her not over the phone but in person so she would know how strong you are and your strength to be a mom to be again. Good luck hun, you have got your hands full!