As others here have cited, my exams/check-ups were scheduled exclusively by my mother. I was not told long in advance, but usually the night before. This would typically leave me a bit restless, but I knew there was no point to arguing or complaining. When I was much younger, it also usually meant a toy afterwards if I did as I was told. Once on the way to the pediatrician's office, I would be quiet and often nervous. I think that is status quo for most kids.
Once there, I got butterflies, each and every time. My mother would check in and then I would read Highlights magazine or sit and talk with my mother. When my name was called, we were taken to the exam room, I was told to undress down to my underpants. The nurse would come in, chat with my mom for a moment, then I was put on the scale, measured, given a blood pressure reading, and then told to lay on my tummy.
At this point, I knew what was coming. I laid there so many time, in this same situation. Listening to the drawer being opened, hearing the sink rinse the alcohol off of the thermometer and then being told to raise my bottom so the nurse could slip down my underpants. The nurses were all middle aged and kind, so it was not a horrible experience, other than feeling very vulnerable and exposed. She would tell me to relax, that it would only be a few minutes and it would be all over. I spoke not one word. I would feel my underpants come down, then her hand would part my bottom and the cold tip of the thermometer would slowly be inserted into me.
Once she was satisfied that it was in far enough, she would place a hand on my lower back and relax me as she talked with my mother. After a few minutes, she would part my bottom again and slowly slide the thermometer out, get the reading and place it in a small metal tray. I would lay there as she cleaned me, then the doctor would come in for the actual physical. This same procedure occurred so many times I cannot remember.