I was at an appointment awhile ago and a high level of nitrites were found in my urine, the midwife was near sure I had an infection but now my urine has come back clear with nothing found. Does anyone know why this has happened? And I have to leave another 2 samples into the doctors tomorrow as they want them to be tested I'm not sure why they want two but apparently they're for 2 different things and I think one is meant to be a mid stream sample.