How to break the news?

Ch
My husband and I live in Europe and we are thinking of ways to break the news that we are expecting a baby to his dad in the US. My parents are easy since they live here and we can do it in person but we won't go to the US for a while and we don't want to tell him only when I'm 4 months pregnant. It is still very early but we're brainstorming. Does anyone have a nice idea how to tell him besides just the regular phone call?