Further, non-STD urinary tract infections (UTI) are very frequent at that age and in the presence of an
enlarged prostate. Finally, urethral STDs almost always cause discharge; painful or urgent
urination, without discharge, usually indicates UTI, not an STD.
For those reasons, it is much more likely that your symptoms were due to a non-STD UTI, or directly to your prostate gland, than to anything you caught during the sexual exposure a few weeks earlier.