I should have made one of the poll options "immediately scream to a room of about 20 relatives 'I'm going to be a grandmother!'"
Typically birthdays in my family mean a quiet dinner and cake with immediate family only. Apparently this year one of my cousins decided to have a party for my mom, and I had no idea. So, I intended to tell my parents and sister early, and let everyone else know in a couple months. Looks like the cat's out of the bag, though. I'm still keeping it off facebook, but I figure it's only a matter of time before someone else posts about it for me.