I repeat that it is impossible that you acquired an STD that started to cause symptoms while having sex. And you can't get an infection in your urethra through a condom. I have nothing more to add. Do not ask any further questions here. If you remain concerned, go back to your doctor.
Dr.
I'm still having the stinging pain in the beginning of urination-it does subise a bit after the initial urine comes out. I took all the antibiotics yesterday and am still a bit concerned about infection of some sort. I inspected the penile tip/opening a bit and it looks ok-no sever redness or bumps. Sorry just nervous it could be soemthing viral.
The spermicide, or some other irritant, is the only possible explanation. Soap in the urethra causes the same symptoms, for example if you washed vigorously soon after sex. (But almost certainly the spermicide in your case, given when the pain started.) No STD can cause pain or any other symptom until at least 2 days later and your negative tests show you didn't have anything. You didn't need the antibiotics, but they won't do any harm.
The pain probably will clear up within another day or two, if it hasn't already. If that happens, don't worry about it. And you might use condoms without spermicide in the future. The spermicide helps prevent pregancy, but doesn't improve STD prevention beyond what the condom itself does.
Best wishes-- HHH, MD