Revealing pregnancy tonight to DH!

I need ideas!

I found out that I was pregnant on Monday and I've kept it a secret from my husband since then because tonight we are having our anniversary photo shoot with a good friend of mine/photographer. I want to tell my husband during the shoot that we are expecting. I had an idea that I could give my friend/photographer a little homemade sign that says something like "he's going to be a daddy" or "we're expecting" or something of the like, and then he would just look at it and she would be able to capture his reaction. Or during the shoot when were posing, I could say, "ok smile, and say we're pregnant!" Or maybe I give him a card during the shoot and tell him that it is his anniversary present and the card can say "roses are red, the grass is green, can't wait to meet you Daddy, in April 2019"? Or something super random and funny like, "roses are red, violets are blue, I really love your beard, guess what - we made a baby" 🤣🤣🤣

I know that all of those are decent ideas but, anyone else have any fun or creative ideas for me?

A little background: he's an architect, I'm a city inspector/engineer, I have two sons from a previous marriage, so this is my husband's first baby. We love doing triathlons together, have seen Hamilton twice, and he loves superheros/comics.

Thanks for any ideas 😁