The white blood cells in your your most likely means some type of infection is present, originating from one of several places-urinary tract, kidney, bladder, etc.
This has nothing to do with HIV. The fact that you had protected sex means you do not have HIV anyway.
They will culture the urine to identify any microorganisms and decide proper treatment.
Well I can not answer that but the only way to know for sure is to take a HIV anti-body test at 3 months to get a accurate test result.
I had a single episode of protected vaginal sex.