Hi Dr. I Had A Risky Exposure For 1 To

Hi Dr. I had a risky exposure for 1 to 3 seconds as a result of a condom break with someone I later confirmed to be positive. I took a pcr qualitative hiv test on the 13/14th day after exposure and came back negative. I then did a duo "combo" test on the 21 and 26th day after exposure and all came back negative. How reliable are these tests?