Work potluck pregnancy announcement ideas!?!

My work is having a potluck on Mon. That will be the first time I see several of my co-workers since my husband and I are starting to share our good news - one coworker already knows, and a few will find out tomorrow :) can anyone give me a creative way to do this with a potluck dish?!? It sounds like a more fun idea than just blurting it out, but I can't come up with anything!