Hi Welcome to Healthcare magic.... Few more questions - 1)Do u have fever ? 2) Was there albumin in the urine? Presence of pus cells and rbc s in urine with a negative urine culture looks less likely to be a UTI , i would like to go ahead with another repeat urine culture and a blood culture too in case you are not on any antibiotic. Secondaly a urinary calculus(stone) can also present with such urinary findings. Get a Ultrasound abdomen looking for a urinary tract calculus. Check your BP, with renal function tests to rule out glomerulonephritis. Anything causing bleed in to the urinary tract can have such finding .