Your symptoms do not suggest genital herpes or any STD. The shot probably was ceftriaxone, a gonorrhea treatment; the azithromycin ("Zmax") covered chlamydia, and a negative urine sample is pretty good evidence against other STDs.
A culture ("swab test") for herpes won't help. If you want to follow up on that possibility, you need a blood test. But if it is positive, there will be no way to know whether you caught it during the exposure you describe or at another time.
I don't suggest you do anything except sit tight; the symptoms will clear up over time. They may be due more to anxiety than anything else. If they continue, check again with your family doctor.
Good luck-- HHH, MD
My boyfriend and I have been sexualy active with each other for about 3 months, we have always used a condom but it has come off once during intercourse because we had gotten really into it and it got a little rough, and a few days ago (the day after we had sex) I noticed a small red bump just inside my vagina. It felt like one of those in-grown pimples and so thats what I thought it was at first. Then I got worried that it might be genital herpes. However I don't have any other symptoms. I don't have a fever, discharge, muscle pain, itching, burning, and it's just one bump. I have not gone to check it out yet with a doctor but I plan to very soon.
If you could help that would be great!
Thank You for your time.