Announcing pregnancy to husband ideas

I found out today I'm expexting our third child. My husband is going to be over the moon to find out, as he's been trying to persuade me to have another for almost a year (I only wanted two). Since this is definitely our last baby, I wanted to do something cute with it. My first pregnancy we found out about in the ER, my second was planned so when I tested positive I ran to him immediately to show the test. I was thinking of giving him the positive test in a very nice box with a baby onesie on Valentine's. I know he is planning on giving me something big, so it would be nice to surprise him with the greatest gift of all. What do you think? Is there anything else I should include? Is it a bad idea?