We've debated as far as telling. I was very public about my losses- it really helped to learn that I wasn't alone, and had several people who had been through the same thing thank me. But I hated that nobody has known until I started "i WAS pregnant"... So at 8w with DS, after seeing the heartbeat at both the 6w scan and 8w scan, we made it public.
Not sure what we'll do this time. We have a scan at 7w, but with all of the holiday things coming up I wouldn't want to make any bad news public at that time. We're currently thinking of telling parents soon, then rest of family at Christmas, and maybe everyone else on new year's (something cheesy like DS wearing a big brother onesie, and a "looking forward to 2016" message)