Hi and welcome to Healthcaremagic. Thank you for your query. These symptoms and signs are suggestive of STD especially if there is associated pain, fever, urethral discharge and recent sexual intercourse. However, if tests are negative then you should first, repeat testing and if this is confirmed then this may be other issue and sign of uroinfection or urinary stones and some other genital infection which is less common.. In every case, antibiotic therapy may be required so test should be done as soon as possible so that appropriate treatment can be started. Till that try to drink plenty of fluids, avoid sexual intercourse and rest. I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.