I got an std test done 3 months ago and it all came back negative. I had received oral sex from a girl I know. I have been in the clear for 14 days then my left testicle is a little irritated but no discharge and not really any burning or any other symptoms. What is the chance of me being positive on an std test from oral sex 1 time after already being tested And being negative no other sexual activity? I do apologies if I am not on the right form. If I am please direct me where I can go