K on april 10th I went to the dr cause I had been feeling really really tired, then i was having mid-flank pain on both sides, and burning with urination so i thought UTI, well the dr did a urinalysis and then called me that afternoon and told me that my urine was positive for bacteria so they called in Bactrum, I took that for 5 days 2times a day. I started feeling better, so I though it had to be gone, mother nature came calling with my monthly gift, then about a week after that I started noticing my flank pain had returned, and I was have pain with urination again off and on, more off than on really. So i finally sucked it up and call the dr today and went back into the office for another urinalysis. I ended up waiting in the office for the results, my urine must have been positive again, because they put me on Cipro for 5 days twice a day this time. Then the nurse told me "last time your urine culture came back negative", so this time she wants you to get a renal ultrasound. The nurse also said that the dr wants to rule out kidney stones. So does that mean I never had bacteria in my urine to begin with last time, and then why was I told that i did. Is it possible to dip test urine for bacteria and it to be positive and then the culture to come out negative?