We received several cards from several couples who are expecting their first children. We already knew they were expecting, but I'm not sure everyone on their Christmas Card lists did.
One just has a couple of photos, one of which is of the very pregnant mother. I thought that was a nice way to announce.
Another has a photo of the couple but it's signed their names "and baby."
The third one has a few photos of the couple and does include an ultrasound photo. The photo didn't weird me out, but I agree with others that all ultrasound photos pretty much look the same.
My biggest issue with announcing pregnancies on cards is that it seems like counting your chickens before they've hatched. I know they're excited, but it just seems premature to me. Like people who are close to you already know you're pregnant, and if you're sending a card to acquaintances, trigger - highlight to read=> it's too much information in case of miscarriage. Then, you have to untell people if you miscarry.