Kidney failure

Patient: I am on kidney dialysis 3 times a week for 4 hours. Sometimes after dialysis I have a spotting of blood in my urin. Last week it was more than a spot, my urin had turned into the color of grape juice. My doctor is sending me tomorrow for a ultra sound on my kindeys and urin test for a bladder infection. It scared me to see urin such a color. Do you have any idea what it is??I also have a broke femur.Thank you in advance