bblogger/Instagram pregnancy announcement?

Tam
Hey everyone!
So, I'm an Instagram beauty blogger with over 61K followers. I've been married for 4 years and expecting our first baby in April. 
I was wondering if there are any Instagramers who haven't announced their pregnancy on social media yet. I really want to keep it a surprise for my followers... if there are any influencers here... when did you guys announce your pregnancy?