announcing on Facebook

Lacey
What is yalls opinion on when to announce the baby on Facebook? I know some people that announce as soon as they find out, and some that don't announce until 2nd trimester. Just curious for opinions! 
Edit: my thought process is this. Yes, something could happen if you announce too early, and you could lose the baby. But, my sister lost hers during the second trimester. It's never guaranteed that something won't happen.