. i had another sti check (this would then be 8 or more weeks later) which was negative...it also turned out i did have an uti.I am worried now as nearly 12 months later i have again has uti symptoms but with a urine test that came back negative for bacteria. What do you think the chances are that the oral sex gave me an sti? i did have a HIV check 3 months later and that was negative.