You posted your question in the wrong forum; see the IMPORTANT notice above.
Not quite 90% are positive by 3 weeks, but more than half of newly infected people have positive results by then. For a more comprehensive reply, you'll need to re-post your question on the HIV Prevention and Safe Sex forum.
HHH, MD
brooksand is wrong. It is not necessary to wait 12 weeks for reliable testing.
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hello mate i think you are getting yourself worked up the minimum time for you to have a test is12 weeks after you think you may have put your self at risk
i think probably you are making your self ill and you have picked up a virus
they very rarely give you a false reading if anything it could say you where positive and then they would re test
if it will help you go back to the clinic chat with a health adviser and if need be have another test
i having been having tests for years and years and i understand how you feel and your worries
stop beating yourself up and go and speak to someone
if you live in the uk you can ring freefone 0800 567 123
take care and good luck