When should I announce my pregnancy?

So I have the nuchal test on Thursday where I’ll be 11 weeks and 5 days. We get the harmony test results on Friday which will also tell the gender and also shows if the baby is likely to have Down syndrome.

The only downfall is that even though we have the ultrasound on Thursday, we don’t actually get the results until a week after.

I’m so excited to tell everyone and don’t want to wait until closer to 13 weeks to announce. Do you think it would be safe enough to tell people after I see there’s a heartbeat at the ultrasound and the harmony test comes back all good or should I wait for the ultrasound results as well just in case there’s something wrong ?

I know it’s my decision but what would you do ?