I have reviewed your numerous other interactions on both the International HIV Prevention Forum and the HIV Prevention Community site. There is nothing that I will say that you have not already heard. You do not know if either of your partners had HIV and statistically it is unlikely that they did. Further, as Teak has informed you, even if a partner did happen to have HIV, neither Dr. Handsfield nor I consider performing oral sex to put a person at risk for HIV. Thus we see no reason for you to even have HIV testing.
If you had been exposed, the data on the DUO tests such as you were tested with are reported for 28 days, at which time the results are completely reliable. there are no day-by-day statistics. since it has been over 28 days since your first exposure, you can be confident that you did not get HIV from the initial exposure. Regarding the 20 day exposure, it is logical that most but not all infections would be detected- at least 60-70% and perhaps more.
Finally, I would point out that the more you ask and search the internet, the more different answers you will get. You need to just decide who you are going to believe and live with it. As I've already said, from my perspective you have nothing to worry about. EWH
sorry, just to clarify, the second exposure was with a different man to the first and I do not know his HIV status