On August 17 in the morning it was or the last time I had sex with my boyfriend (without protection), September 13 (27 days with 3 hours on the 28th) I took a test for HIV AG - AC (4th generation) giving 0.15 , not reactive. From 17 until today I have not had anything with him. The doubts come to me because he told me in a fight that he was unfaithful and more behaviors that I did not like and I returned to my country. I am afraid I have caught something. On September 16 (to the 31st) I took another test that read like this: HIV ac-ag (3rd / 4th generation) eclia 0.21 non-reactive. Are both tests 4th generation? are they the same as duo or combi tests? are they conclusive? What is the window of the tests that I did? should I repeat the day 42? the result can change? I am very afraid. Help :(