When should I announce to family?

According to the app I am 11 weeks and six days. I paid for a private scan on Sunday as I previously had a miscarriage. I was measuring 12 weeks and 2 day according to the scan and baby had a strong heartbeat of 165. I have my 12 week scan with the hospital on Monday but was.wondering if it would be safe to tell family this Sunday before the scan. My husbands family live 3 hours away so we were going to visit and tell them the news. We would only be able to visit on the Sunday as we work 6 days a week and would not be able to go visit until the following weekend otherwise.

Do you think it would be OK to tell them or should be wait until the following weekend?