Has everyone ever heard of false positives from taking Xanax? For the past two and a half weeks, I've had pelvis pain and a constant (and I mean constant) urge to pee and incontinence all day. I've had so many pregnancy tests and they all came back negative. My anxiety was so bad so on Friday I started Xanax from my doctor. I took .5 dose twice on Friday, twice on Saturday and once today. Then I realized today was the second day of my missed period. This is what I got: