24HIV test ALL Negative:?

I experinced hot sweats, wieght lost and a white tongue.I have taken 24 HIV test many of which were well ped the 3 month and 6 month windows. My tongue still has the white coating thus tests has continued. Please advise if antibodies can form late ( after 12 months) and what are your thoughts on PCR test vs antibody tests which i have been taking. Thanks for your help!