It's up to you. With my first 3 I told everyone right after I took the test. But with his one me and my husband decided to wait until we are 13wks Since our last pregnancy ended in miscarriage. I'm so ready to tell everyone. It's so hard not to!!
I think it's totally up to you :) but most wait until they get thru their first trimester. You do what you feel most comfortable! Good luck to you :)