C.O.
M.:
Welcome to mamapedia!!
If you have had unprotected sex, you can be pregnant. if you have had three pregnancy tests come back negative, you are most likely NOT pregnant.
It's more important to get rid of that UTI before it turns into a kidney infection - if it's not a kidney infection already since you said you have it for a while. And that type of infection CAN through off your body and your hormones.
Good luck!