It certainly is possible to have a UTI without significant symptoms. You can actually have a condition called bacteruria in which there are bacteria in the urinary tract
but not causing symptoms. Your urine should be cultured.
You didn't say why you had the urine test or how the urine was collected - e.g. clean-catch or not. You also did not say whether you are sexually active. This matters too.
If your urine culture is positive you should be given antibiotics to clear it and then re-test. If your urine culture is negative then other sources will need to be sought.