Oh, well, this is not a risk for HIV. HIV is only spread through unprotected vaginal or anal sex (with penetration) or sharing IV drug needles. Air and saliva inactivate the virus. So, oral sex never results in transmission. There isn't a single documented, proven case of it happening in 40 plus years of HIV data. Even with the cut in your mouth, you will not get HIV this way. So, no risk or reason to test.