Hi, if you donot have any white puss discharge from your penis or any burning when urinating that happen at the 5 day mark, you can pretty much rule out the more common std,s like Gono and Chlamydia.Testing would not be recommended when no symptoms are present unless you have a long term partner. The more common std,s would be a simple UTI. You know your body and if you feel something not quite right then see a doctor and can run some urine and swab tests.
Chlamydia and gonorrhea - You can test now
Syphilis - 6 weeks after exposure
Remember that most people don't have STD's and most singles exposures don't transmit them.