After being pregnant twice I know what U/S pics look like. Just because there is one on the fridge doesn't mean those aren't on the counter. You get different u/s pics at different visits. The one on the fridge could be from her very first visit to dtermine she is pregnant, you know when the baby looks like a peanut. Then when you go back for the sex of the baby they will take numerous ones and when the tech prints them that is how they print out. I have several like those from both pregnancies. Who know she may have been showing them to SS that night.