Scared to tell

Okay, so I’m 21 and my other half is 28 obviously old enough to make our own adult decisions right? But my mother is completely against my having children for a few years because we’re currently trying to find a house (we live in his semi while he works driving it) well we found out I’m 7 weeks pregnant and eventually are going to have to tell her. She’s made it clear she will not speak to me if I become pregnant and will “kill” me. I need my mom during this but I’m afraid to tell her😔. So confused what to do?