With DS I never even told Facebook, a year after he was born I had people like "when did you have a baby" I just didn't care. Didn't hide it but never made "the announcement". And wen I say "didn't care" I mean about the whole wide web knowing, not about DS of course haha!
SO knew right away, told him right after test was taken.
I was in college at the time, told most of the people and teachers there after I had it confirmed by the doctor, so they understood why I was late and booking it out of the clas to go it randomly.
Everyone else as I recall was around 3-4months or so in.
When I do get pregnant again, if it's before Christmas. I will probably use the holiday to reveal to my parents and sister ( and SO's mom and sister if he wants)
SO's brother and his fiancé will probably know right away, we are very close with them and they know how to keep a secret.
Everyone else I will wait to tell until after 12-20 weeks to get of the fears of "what ifs.."