Hi sir I have exposure but I start pep within 72 hour I finish pep treatment after that I take 2 test 1.) immediately I take hiv combo test after pep finish.(mean 30 days after exposure) 2) hiv dna pcr qualitative test after 18 days pep finish (mean 48 day after exposure) 3) it is conclusive or not 4.) pep treatment extend the window period or not sir plz.