Warning.. this is a very long post, mostly about me ranting but also needing advice...

Recently, my boyfriend (24) and I (21) found out on Christmas Day that we were expecting. We’ve only been together for 3 months so it’s already a big shock to us and trying to come to terms with it. We’re still trying to feel out the situation amongst ourselves, let alone our family. When we told my parents, they were really happy. We haven’t told his parents yet considering I haven’t even met them. We plan on having me meet them and then telling them after my first doctors appointment. My stepdad wants to tell his mother after I specifically said I didn’t want anyone else to know right now. His mother goes to the same church as my paternal grandma and they are really good friends. I haven’t told my grandma yet but my step dad won’t lay off the situation. I’m afraid he’s going to tell her and she will tell my grandma, then my entire family will know and I won’t get to tell them myself... the situation has me stressing to the point of tears and honestly I don’t know what to do because I don’t want to be mean about it 😭

Am I over reacting for telling my stepdad he can’t tell his mother? I feel like when it comes to my child, i should have the say in who knows and who doesn’t...