From someone who has had repeted miscarriages my philosophy is is tell those who you would tell that you miscarried. It certainly suck and is great to have people's support and encouragement.
I am a teller and find it impossible to keep the news to myself... I have told my sister (who is so happy for me but is telling me not to get to excited until farther along). I also told 2 very close mom friends and you ladies.
The risk of miscarriage drops significantly when you see or hear a heartbeat. And continues to drop. I forget the exact but that would be something goo to look up and discuss with your husband and may impact his thoughts in haring the news. For my husband it's a combination of fear of miscarriage and he is more private than I am. The firt time i was pregnant i told my sister only and honored my husbands wishes to wait to tell anyone else. I ended up miscarring at 5.5 weeks and I needed my parents support and support from a few close friends to help me grieve. Going forward my husband left the telling up to my discretion
This will be our last pregnancy so I do want to tell our parents in a creative way. I will wait at least a few weeks since when I miscarry it seems to be around 6 weeks or less.
So happy you are getting an early ultrasound! I was seeing a specialist after my 4 miscarriages so I got several early ultrasounds with my dd (now 19 months). Now that I'm not seeing a specialist I won't even get an appointment till around 10 weeks. And only 1 ultra sound at 18-20 weeks unless complications require more. It is going to be so hard waiting for the first appointment without the reassurance of an ultrasound
Good luck on your decision to when to share this special news.... I certainly understand wanting to shout it from the rooftops