Your last negative result concludes every thing provided there was no potential exposure in between.
Stop poking your self with prick tests after each time you have sex, that seems to be quite an obsession for you.
It's natural to have sex. If you are protected for vaginal or anal intercourse in a monogamous relationship or using condoms correctly and consistently for polygamous relationships. You don't need to test.
Correct, there is no documented cases of infection via oral sex
This answers all of your HIV questions, and if you can think of any more just reread about the 3. You had zero risk therefore testing is irrelevant to your situation because you had zero risk. HIV is a fragile virus, which is instantly inactivated in air and also in saliva which means it is effectively dead so it can't infect from touching, external rubbing or oral activities. It doesn't matter if you and they were actively bleeding or had cuts at the time either because the HIV is effectively dead.
Only 3 adult risks are the following:
1. unprotected penetrating vaginal with a penis
2. unprotected penetrating anal sex with a penis
3. sharing needles that you inject with.
The only way to get HIV is if you did one of the 3. The situation you describe is a long way from any of these 3.
Even with blood, lactation, cuts, rashes, burns, etc the air or the saliva does not allow inactivated virus to infect from touching, external rubbing or oral activities. Doctors have calculated the risk from what you describe to be less than that of being hit by a meteor, therefore no one will get HIV from what you did in the next 40 years of your life either. The above HIV science is 40 years old and very well established, so no detail that you can add to your encounter will change it from zero risk.
Until you stop googling for death all over the internet, you will never get peace because " every website I researched have a different standing on receiving oral sex." We rely on the opinion of expert doctors and don't pay attention to anything you can locate on another site, otherwise we will be here all day arguing.