You had NO RISK for HIV from the oral sex, even with some minor mouth issues present at the time. BOTH you and your partner would have to have open, actively bleeding wounds at the time for there to me a marginal exposure. Human saliva contains bacteria and enzymes that render the virus virtually inactive (Unable to infect) as well as the fact there is abundant air in the mouth to also render the virus inactive.
Oral sex, on the other hand, is a definite risk for STD's such as chlamydia, gonorrhea, syphilis and others and it's important you be checked for those. I would strongly urge you to talk with the folks at our STD Forum for correct incubation times for each STD.
The link to our STD Forum is: http://www.medhelp.org/forums/STDs---STIs/show/98
It is recommended that anyone who engages in oral sex be checked every 3 months for possible STD infections as many can be asymptomatic for years.
Wishing you the best