I had unprotected oral sex a week ago. A couple days ago I started noticing a yellow discharge from my penis. I was randomly tested for chlamydia and gonorhee about a month ago and all came up negative. We had unprotected oral for only a couple minutes and used a condom for vaginal sex. It does not burn when I pee but this discharge has been throughout the entire day the last few days. Could this be anything other than an STD? What are the chances I got an STD from just oral?