I'm pregnant with my second too!how I revealed it was I took a picture of my son sitting next to a poster I made that said I'M GOING TO BE A BIG BROTHER and put my due date :-)
My Co worker gave us prego spaghetti sauce and had a sticky not on it saying Guess who then the sauce name prego
We did ours on Father's day by having both families over and the grandmas pulled an outfit (gender specific) from a gift bag. Firefighter onsie for boy or nurse onsie for girl (hubby is a firefighter, I'm a nurse).
Found mine on Pinterest! Tons of cool ideas :)