Dear doctor, I’m living in Dubai , I already have OCD , I had protected sex with escort with unknown status Russian , no oral sex was there , I have small red pimple on different part of the body , I did all the STD test along with the 4th combo HIV test , after 8 weeks , now my question is I still have this red pimples coming for 2 days and then going and then coming and going , how sure I can be about my test , is it 99.9% or it’s 100% , should I test again ? 

HBsAg ( Hepatitis B Surface Antigen )

Just last update ? When u say low risk what that mean by number please and have u ever seen or heard some had protected sex and then tested negative after 8 weeks but later on by any mistake happens turn to positive by another test 

Welcome to the forum. Thank you for your confidence in our advice and for your succinct question. My reply is similar.---

Your follow-up question is irrelevant in terms of your current risk and likelihood of infection. Whether you classify the exposure you have described as zero risk or low risk doesn't matter, since your test results prove you do not have HIV or any of the other infections for which you were tested. Don't try to split hairs between such terms as "low", "zero", "virtually zero", etc in terms of STD/HIV risk. There's no real difference between them.---
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First doctor I would like to thank you and say that what you are doing is incredible amazing, you can’t imagine the help which you helping us how much valuable, second I just have the following last question please:

1. A properly used condom that does not break is around 99% effective against HIV and most STIs.---