Announcing pregnancy

I want to announce it to the whole world that were pregnant we've been trying for 2 years and I finally got my BFP on Tuesday making me little of 5 weeks. My family and closest friends know but should I let all my other friends know this early. I'm having mixed feelings I made a "every superhero needs a sidekick" sign for my 3 year old son to hold and I'm dying to post it. My first Dr appt and ultrasound are not until Nov 18 I honestly don't think I can wait. Thoughts?!