I've had this difficulty.
I wanted to wait until the 20 week scan before telling anyone because personally if a fatal or very serious problem was found, I would terminate.
I'm a hugely numbers oriented person and have literally obsessed over % chance of miscarriage every week since getting pregnant.
I'm now almost 15 weeks, getting married next week and have booked a scan for the day after when we will then tell people.
I'd personally wait until after your 12 week scan where the chance of miscarriage is under 2%. After 16 weeks it's about 0.5%.
I worked out the chance of having to terminate after 20 week scan (discounting the 3 trisomies which I already tested for) and worked out it was minuscule - something like 0.18%.
I also looked at what I'd have to go through if I decided to terminate a pregnancy fairly late on and I thought it was quite horrific so would at the very least need to tell my parents.
This maybe isn't the answer you were looking for but the numbers are very much in your favour after the 12 week scan but feel free to leave it a few extra weeks if that feels more comfortable.
As it's your first you can probably hide it until 20-22 weeks in any case 😊