We told our family and close friends right away, and just announced on Facebook on Friday. For me, it's important that people know I am a mother of two, even if the worst does happen. And I am doing my best to celebrate every moment of pregnancy I am given.
With DD, we announced at 6 weeks and then had a threatened miscarriage - no regrets, in fact having all of that support and not having to pretend I was okay when I wasn't made it so much easier to get through.
It's such a personal decision though, and there's no wrong or right answer!