What is the actual window period of hiv? what if i am tested with elisa hiv after six month in intial expose the result?

Uninfected: If you are elisa assay negative 6 months after exposure to HIV you are almost certainly free of infection. Anything is possible, but absent an inability to form antibodies you should have converted to a positive assay if you were infected. The better question is why you are allowing yourself to be exposed. Use protection. Be careful, trust nobody (when it comes to sex).