Is a urine test enough for my case (possible STI) ?

I had unprotected sex recently, about a week ago, and now I am showing signs of a possible STI, redness in the tip of my penis, mild testicle pain, occasional mild urethral pain (not peeing related), no burning, no itching, no discharge (or maybe a little occasionally but very clear), a little change in my penis... show more I had unprotected sex recently, about a week ago, and now I am showing signs of a possible STI, redness in the tip of my penis, mild testicle pain, occasional mild urethral pain (not peeing related), no burning, no itching, no discharge (or maybe a little occasionally but very clear), a little change in my penis smell, I am not circumcised by the way, the penis tip redness started the day after I had sex. Online sites point me to Chlamydia. I know going to the doctor is the way to go. But, can a simple urine test tell me which STI do I possibly have? What is the best lab test for this?
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