hello i have one question here back in 3 years ago im doing something silly yes sex without protection at prostitute place and doing tes in 2nd,4th,12th,36th month all done with 3 different reagents at gov clinic all come with nr result one day i dicided to peace my mind with doing tes at public lab but tes result comes out inderteminate with detail cmia nr,immuno reaktif (same kind with rapid test ),and elfa tes nr doctor recommend me to take greater test what should i do? does window period is ******** ?