Haven’t announced second child yet

I’m 21 weeks and still have only told immediate family. No one else. I post regularly on Instagram and I figured it would be awkward if I didn’t announce and I randomly just have 2 kids all of a sudden lol. I know it’s dumb to worry about but I still have no idea how to even announce. Any ideas would be appreciated. I wanted to do a confetti background in either blue or pink and put the ultrasound on top of it so everyone knows im expecting and what the gender is all in one. Does that sound good?