That happen to me once. It turned out to be nothing.
We can't give medication advice
thanks for your help but i started tk take terivid 400mg (ofloxacin). is it ok.
To my knowledge, no std can react so fast to the point of causing symptoms in the same instance when you were exposed to them.
It seems more likely that you might have had a bit of a rough sex session, resulting in some minor damage to the urethra or surrounding tissue.
I would suggest you go to a urologist to have your penis checked out just in case...
Also, if you want, in approximately 4 days, you could do tests for: chlamydia, gonorrhea, ureaplasma, mycoplasma and trichomoniasis.
For syphilis (if you want to check it out), you'll have to wait 6 weeks before testing to know conclusively.