Thankfully he was in a good mood! They finally called us back and we waited some more.
When the doctor showed up, it was thankfully a pretty non eventful appointment. The doctor was surprised to see a calcium deposit that young (he confirmed they normally show up around 4-5 years old.) but he said it was still small and didn't seem to be causing him any pain. He checked the rest of his body and flexed all this joints. He didn't locate any more. He said that he wasn't concerned, but if it got bigger, seemed to cause him pain, or if we noticed more, we should bring him back, but otherwise he didn't need to see him again. Whew! The was good news :)
When I got back I picked the kids up and I took them to the park.