I had an hiv duo test at 18 days after exposure, Result was (.23) non reactive. Afer 25 days after exposure I had P24 elfa test, Result negative. After 31 days of exposure I had duo test again, Result (.67) non reactive There is so much increase in the value. Why? I am really scared about it Does this value below 1 matters? And how reliable are my results? Please reply.