Announcement on social media?

Megan • Happily married. One 2015 angel baby, little girl born Sept 2016, & one due June 2019.
Hi everyone! My hubby and I plan to announce on Facebook after our 12 week scan on 3/15. I figured I'd announce on St. Patrick's Day since it's only a few days later and I'll be 13 weeks exactly. 
Does anyone have any cute or creative ideas? Thanks!