i had my hiv test last june 22,2010 the result was negative but i'm still confuse about the window period.i had an unprotected sex with the guy for almost 4 months from november to march 2010..my 1st exposure was november 25 and my last was march 3, 2010..i just want to k now if there's a possibility that i have the virus even if im negative with the test?