Brief Penile Discharge

I had a very brief episode of unprotected sex last week. Yesterday I noticed a slight irritation at the tip of my penis, though it didn't burn particularly during urination, and a slight yellow-white discharge. Today the discharge appears to have abated and try as I might to milk some out, none seems to come. I had gonorrhea once and produced a similar discharge during it, but as I recall the discharge increased in frequency and volume after I first noticed symptoms, whereas my discharge has appeared to stop (at least today). Is it possible that I have a type of self-limiting NGU that has managed to clear itself up without antibiotics? I don't currently live in the United States but I'm visiting my family here for a month, so I have no health insurance and am scared about the cost of an STD scan and the subsequent costs for a prescribed course of antibiotics. In Europe, where I live, all of this would be treated same day, for free, in a walk-up clinic, but no such centers seem to exist here in the US.