Not knowing that, it sounds like your doctor did standard tests for
urinary tract infection (UTI), which doesn't necessarily include STD testing. Ideally, all doctors would routinely include STD testing in this situation, but many do not. You should ask the doctor whether the tests included gonorrhea and chlamydia, but my guess is they didn't. Also, evaluating for NGU requires close physical exam of the penis, looking for discharge and inflammation.