Have baby wear a big sis/bro shirt
Put a hamburger bun in the oven! Or maybe wait until your first ultrasound appointment and have your first one hand the photo to your husband. Or!! You could take him out to eat, and when you get the bill pretend to be exasperated by the price when you look at it, but it’s really a picture of your nugget
A video collage of your family up to your new pregnancy with text that says something like “ Now let’s share more memories together as a family of 4” with an ultrasound photo in the collage or a really nice “We are pregnant “ cake