Gender reveal

I know it's so trivial but I'm so angry with my SO. We found out we are having a boy yesterday and I really wanted to keep the gender a secret till right after our wedding to do a cute gender reveal. Well I find out my SO told his two good friends yesterday that we are having a boy. Both friends have big mouths so I feel like now we have to tell our families because I don't want them to accidentally find out From a random stranger.
I know I'm probably overreacting but I have been planning this for months and I'm so upset!!! He thinks I'm just being silly but we didn't get to tell people in a cute way that we were pregnant so I wanted this to be special.