Took uti test strip, very slightly positive for leu and negative for nitrates. what does that mean? only symptom is frequent urination, nothing else.

You MIGHT: have a uti. See a doctor, because you need further testing and perhaps a course of antibiotics.

Probably no UTI: Frequency without urgency and burning usually isn't due to UTI, pretty much confirmed by weak leukocyte esterase and negative nitrate. Lots of things can make LE weakly positive -- most often inadequate clean-catch specimen, contamined with vaginal/labial fluid. If frequency continues, especially with urine volume well above fluid intake, see your doctor. Any diabetes risk (obesity, family?)