When to announce your pregnancy?

Hello! I'm a little over 7 weeks pregnant with my first little one and I'm bursting at the seams trying to hold in the news! It's so hard when it's all that I think about now! My boyfriend and I want to take cute pregnancy announcement pictures soon, but we don't know WHEN would be a good time to post them. 
Does anyone have any advice on this? I was thinking 9 weeks, but is that still a little too early? 
By the way, our close friends and immediate family know the news already :) it's hard for EVERYONE involved to keep their mouths shut! Haha