Did you give or receive oral, or both? If you gave, was it on a penis or vagina?
Yes, if you received oral, your results at 20 days are accurate. Have you seen a doctor about your ache? That's far more concerning than the wet feeling. How old are you?
An ache in your testicle can be anything from a varicocele, which is an enlarged vein and common, or epididymitis to an injury to cancer.
You should definitely get it checked out. Don't be alarmed, as it may be nothing serious, but get it checked.