I just got my HIV test done yesterday. the result came out to be negative. My OD ratio came out to be 0.3 and the cut off marked was 0.4 . Yesterday I had sex with a guy without using condom. Now I want to know that what is the OD ratio to be HIV +ve and also when can I again have test to check that i have not been affected by HIV by having sex with that guy? Also tell me that whether thsi OD ratio always increases or does it decrease also?