Dear student , get relieved. The spread though very uncommon through this way, is theoritically possible though
however, some facts show that 1) the virus is alive in the blood only for 45 seconds outiside the body, 2) spread through oral contacts with the infected person though possible is negligable. 3) since you say that you tasted the blood, it is possible to spread only if you have bleeding gums or a injury in the ourside or inside portions of the mouth though which the virus can enter the blood stream. 4) if you are unsure, and would like to consult for medical treatment, if you are still within the 72 hour period after the possible infection, you could consult your doctor for a prophylaxis treatment if necessary. Or get yourself relieved and go for a hiv antibody test after 3 months to get yourself relieved of the thoughts.
Good luck and god bless