I'm 7 weeks pregnant should I announce?

I got an early ultrasound at 6 weeks 6 days because I thought I was further along than I am. The baby had a lower heart rate but they said that could be normal since it's still so early. We couldn't hear it but could see it. I want to announce on Facebook because I'm excited but I'm nervous to do so because I know 1st trimester is when I should be worried most about miscarrying. Did anyone else announce to the world super early on? Did you regret it? 

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