my Question is:
will a hiv positive person ALWAYS test positive after his window period, by using rapid test cassettes? for example, if he tests positive at 3 months after exposure, will he also test positive 4, 5 ,6 or more months after exposure?
or are there any times that hiv antibody levels decrease so that undetectable by tests?
i can easily access rapid test devices (because of my job),,,after a low risk exposure (cunnilingus on a bloody vagina) ,i tested myself for several times during 7 months after that exposure, all negative,,,but i remember that when i wanted to throw away one of my negative tests wich i did 3 months after exposure, i noticed a brown (not red) line in test region, i was shocked, i saw this line more than 2 hours after the test was done,,,i should add we should read the result 20 minutes after the test (NOT MORE) according to the manufacturer, but i am still concerned,,,of course i tested maybe 40 times all negative after that one, but still worried, is it possible that that test was positive and all my other tests were falase negatives?