S.H.
Sound like our first bout of a UTI. Accidents all the time. Negative test. It wasn't until the UTI progressed into a kidney infection and 6 days of fever they tested again and it was quite positive! However, every time after, the UTI tests in office (and the ones from the dollar store) came up positive right away.
If you are anxious, you can get some tests at the dollar store and retest. But I am sure this will be worked out!!