There is no risk in protected oral sex or even unprotected oral sex. To date, there has not been a proven, documented case of HIV from oral sex. Experts agree it may be a tiny theoretical risk but in practical worlds, it just doesn't happen. Two things inactivate the virus, air and saliva. Both are present during oral sex. You do not need to worry about this as it was not a risk in any way.
The only risks are unprotected vaginal or anal, penetrating intercourse or sharing IV drug needles. Don't engage in that activity, and you will never have to worry about HIV.