HIV is spread by sexual contact with an infected person, by sharing needles and/or syringes (primarily for drug injection) with someone who is infected, or, less commonly (and now very rarely in countries where blood is screened for HIV antibodies), through transfusions of infected blood or blood clotting factors.
If a form of barrier contraception was used (i.e. a condon) and the only form of fluid contact was saliva, the risk of transmission of HIV is exceedingly low.
Obtaining an HIV test result (as you are doing) as well as repeating it a several months if there continues to be suspicion is suggested.
I would suggest visiting this website for further information:
http://www.cdc.gov/hiv/pubs/facts/transmission.htm
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.