Pretty Litter - Are the colors accurate? Should I be concerned if its blue once or twice but my cat is acting normally?

I got a bag of pretty litter and ive been using it for maybe a week. It turns colors based on the cats general bladder health. Its supposed to turn blue if theres a possible UTI, it has turned a dark blue 2 times out of 7+ish days ive been using it. Other that that I have not noticed any unusual behaviors.

Given the mixed reviews and potential for false positives is this something I should be concerned about? I honestly cant tell.