Did you go read the case studies? If you are so worried about having sex and contracting HIV don't do it, period.
Oral sex carries a very low risk. So low that it is not recommended to get tested. 1in20,000 for receptive and 1in10,000 for insertive.
As far as ejaculate, that is a high risk bodily fluid. If you have a cut in your mouth, transmission can occur through this route.
You were never at risk. Period.