You were never at risk. 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.
Did you go read the case studies? If you are so worried about having sex and contracting HIV don't do it, period.