Late pregnancy announcement?

B e A m * • ⚽️ #1 Jul 17 🌷#2 Mar 20 🚗 #3 Feb 24
Anyone hasn't announced their pregnancy yet? How many weeks are you and when do you plan to announce it?
I'm 21 weeks 6 days and no one knows I'm having a baby, besides my family and relatives. I'm thinking about announcing it on social media  on our 8th year anniversary. And that's only about 6-7 weeks before the baby arrives. Sometimes I'm concerned if people will get upset that we've been keeping the secret for so long. But we don't feel like announcing it yet. 
Anyone announced their pregnancy late? What was the reaction you got?