can't really say what the chance is because no one here knows what you do.
Again I default to what canadian_dude said, He is right on in his advice.
Actually I started getting pain 2 days after. Also, I work graveyard at an office and sit for up to 6-7 hours straight without getting up. Sometimes I feel like I am sitting on my sack which hurts. Whats the chances that I got some outside injury the same week as getting a unprotected **? This week it was really cold so I put the heated seats on high without noticing and my balls became really hot, like burning. I am just wondering if these outside factors are giving me the pain or if I got something from this girl...
Agree with canadian_dude09
I think you should be fine. sometimes anxiety can cause testicle pain, and symptoms of stds rarely show up just 4 days after exposure.
However, having said that, you should watch out for any yellowish or greenish discharge, pain or burning sensation during urination, any bumps or sores on your penis.
If you ARE really worried, get tested. But i would say ur fine.