Hi. Well, I am 31 years old. About a week ago, I noticed a small weak pain in my right testicle. It came and went and I didn't pay it too much attention until I read on the web that this could be a sign of testicular cancer. When I say pain, I really don't know how to explain it as the pain is so weak, it barely hurts, but is more of an aggravation. Well, sometimes it hurts in my right testicle and sometimes in my left. I have done a self exam, as best as I know how and found no lumps. I paid my doctor a visit and he also did an exam, he said everything felt normal size and he couldn't feel any lumps. He prescribed me Bactrim DS and told me to take 2 a day for 14 days. I am on my 3rd day of taking this med and the pain still comes and goes. How long does it take for Bactrim DS to go into effect and do you think this is cancer?