Hey king,
Just wanted to throw in my two cents since I had the same problem recently. I'm in the military and I have to pass an extensive physical once a year. Last physical was one month ago and, same as you, I had small traces of blood in my urine sample. Anytime there 's blood in urine, people tend to freak out a bit. I had to piss for them three times and see a specialist and as it turns out, it's not a big deal, actually quite common with athletes, especially people that run alot. With strenuouse excersise, red blood cells get pushed through the kidneys, it doesn't mean that there is bleeding anywhere. Think of it this way, if you had an infection or some other problem that would cause bleeding (cancer), your white blood cell count would be elevated and you would most likely be running a small fever.
Also, protein and creatine powders can irritate the kidneys and cause this problem as well, once again not a big deal as long as you drink plenty of water and take a week or two off of the supps every once and a while.
Hope this is helpful, assuming you were having the same problem that I was...