some STD will, like Chlamydia and Gonnehrea would probably show up right away but it can take up to six months before HIV can be detected.. If you want to be tested u can go see your local clinic or hospital and they will do a urine test or pap smear to test for the first two and B/W for HIV, Hep B and possibly syphilis.. you just tell the nurse or dr what you just typed and they'll be sure to help u out..