so ive been feeling like i have a uti so the drs have tested my urine 3 times in the past few weeks all of which were clear but they found red blood cells as well as skin cells but no infection i also had swabs done which were all clear of any infections and no thrush too. i have to do a follow up urine test again. if its not a uti what could be going on? got constant burning in my bladder. could it still be a uti but the tests aren't picking it up? Or maybe urinary retention?