The symptoms associated with STDs and STIs can vary for each infection and disease, as some can present as early as 7 days after exposure while others may take up to one month to show. If you are concerned about exposure or having contracted an STD or STI, it is important to wait till you begin to show symptoms, as early testing done during the intubation period (from the time of contact to the onset of symptoms) means you risk getting a negative test as the body has not started to create the antigens needed to determine if you have caught an STD or STI.