when to announce?/ thank you!

*** thank you all so much for your fast and nice response, I will consider all opinions and think very hard on this!!the excitement is so hard to contain but I want to play it safe as possible considering I'm a wee bit at risk with my health issues, but again thank you all so very much!**********

so I'm 4 weeks and 1 day I have a Dr appointment scheduled with my ob on the 30th? when should we tell people? My husband is pushing for Christmas but that's 10 weeks? I'm not sure the protocol here? lol