Not necessarily normal, but not too uncommon. I would not be surprised if he had a bit of a stricture that the doc dilated during the exam, hence the pain and inability to complete the exam! The bleeding would be from the dilation, and yes, that would be expected. Next time the doc wants to do the exam, he may have to do it under sedation. Your son is too young to have to put up with fat fingers in a tight butt! Heck, I'm too young for that!
Jan