Hi i have sex with a prostitute on july after that i saw some blood on my condom and my hand on september i have joint pain and mild fever after 3 month i check hiv rapid test twice the result came negative and i test again after 4 month also the result came negative still i have some pain on my jointand some rashes so am worried this rapid test is accurate or shall i test again some other test ex elisa pls reply me
Since you did the testing after 3 month, the negative result must mean negative.
The only problem can be if you made mistakes in the testing procedure.
The advantage of a professional laboratory is that they have a very strict quality control.
If you have doubts about your test results the best if you get tested in a laboratory. You are after the window period, so you can do it any time.