Thank you doctor. Just to clarify, there is no abdominal pain, just testicle.
From reading your previous posts, am I to assume this was a low risk encounter with even lower risk of any potential transmissions (with regards to anything not tested for)? if this is the case I shall not seek further testing and put this behind me.
Welcome to the forum. Thanks for your question and for your kind comments about the forum. I'll go directly to your questions.
1) Yes, it is safe to assume your test was accurate and reliable and that you don't have a chlamydial infection. Same for gonorrhea, which is usually automatically tested along with chlamydia.
2) Most chlamydial infections and virtually all gonorrhea would indeed cause symptoms you would notice, if somehow the test results had been wrong.
3,4) Gonorrhea or chlamydia can cause epididymitis, i.e. infection ascending into a testicle. However, that's not a possibility given your negative test results and apparent lack of other symptoms typical for these STDs (urethral discharge, sometimes pain with urination). That said, I'm inclined to doubt the weight lifting as the cause. Mild testicular and low abdominal pain or scrotum pain commonly are related to the prostate gland -- and almost always are not due to any STD.
5) The timing is fine for STD testing related to an exposure 5 months earlier. However, your symptoms are not at all suspicious for any STD, or for the infections you mention. I'm confident your symptoms are not due to any infection from that event. But if you want still further reassurance, visit a physician or clinic for professional evaluations. (But don't spend money on self-testing through an online service. If you do anything at all, do it right and be professionally evaluated.)
Best wishes-- HHH, MD