Still haven’t announced

I still haven’t announced this pregnancy. I’m 24 weeks. The only people that know are my kids, boyfriend, his parents, my mom and a couple of our friends. He posted on his story and said “March 8th my son will be here”. And now he keeps pressing me to announce it on my social media. I really just don’t want to. I wanted to post the ultrasounds as an actual announcement but I have been putting it off for 3 weeks now. He’s pushing me to do it so I was thinking about just posting something on my story like saying I’m pregnant but idk what to say lol. Can y’all help me out with some ideas please.