I had a kidney stone and a double-j stent. after some work on the car i pee blood. is that normal?

Blood in urine: Any blood in the urine is not normal. However, after stone removal and double stent, some blood in the urine may simply reflect bruising and trauma. I think a look to see if a stone remnant might still be lingering is a good thing to do. Ultrasound can be a sufficient test. Be sure you drink 3 liters of fluid per day. Be sure you drink lots of lemonade and lemon extract.