Hlo sir, my name is rahul. I had unprotected oral sex with a guy on 26 may 2019 but I don?t know his hiv status. After sex I worry about hiv. I consult the doctor and he suggested pep drug (emtricitabine & tenofovir, and darunavir and ritonavir). These medicine I start on 28 may 2019. I finished these medicine on 26 june 2019. On the 3 july 2019 I go for hiv test and the test result is nonreactive and index value is 0.07 after one week I feel a neck infection like sore throat than on the 16 july I go for another hiv screening test and the test results is nonreactive and index value is 0.13 on the 3 august 2019 I go for another test and my test result is nonreactive (negative) and index value is 0.16.my question is why my index value is change and always increasing?