You should take your child to a child specalist. These syptoms can be found in children, but are not highly common. Urine can change colors because of medications, but blood could come from infected, funtion issues, or even bruseing. How long has this been going on? Boys will be boys. It could be possible that your child was hit or ran into something. Im not shore that, with it continueing for a few weeks, that is possible; but with the strep, and his ammune system being down because of the strep, it may be possible. It is very unlikely though. But is this is true, it should repair its self.