How do I tell my family that I’m pregnant?

For context I’m 18 years old Turing 19 in a few days and my fiancé and I have been together for two years now and I’m very happy with him. Just yesterday my grandmother helped me by being the co signer for our apartment and we have been moved in and unpacking. I wanted my own place for my baby it’s spacious clean and a safe environment. I’m already 25 weeks pregnant and I haven’t told any of my family I’m scared that they’ll say “im too young” or that I’ve “wasted my life,” or that I’m just barely started being an adult. My grandparents and I are close but my grandmother practically raised me so in her head I’m still her baby she still tries so hold my hand to cross the road even if it’s a tiny cross way. She babies me a lot and I’m super grateful for her but that makes it harder for me to tell her,but I also don’t want to lie to her because my belly is starting to pop I’m a little chubby so before I assume she just thought I’ve gained more weight. But I feel scared to bring it up because I want them to respect me as an adult because I have a job I work hard I got a raise and I never ask for much i just don’t know what they’ll say but I don’t want to lie to them about my stomach or have to hide my baby stuff in my apartment. Even though my mother and I believe my grandmother got pregnant at 18 it makes me scared to tell her because she’s always saying how she doesn’t like kids or she doesn’t want me to have any kids or “thank god that (I) don’t have any kids”. Please help.