Oral sex or blow jobs are not a risk for HIV. HIV is transmitted by unprotected vaginal or anal sex or sharing IV drug needles. Those are the only ways people really get HIV. Oral sex has two things that make it a non risk, saliva and air. Air inactivates the virus and saliva has enzymes in it that inactivate the virus. So, this is not a risk, you don't need to test and can move on without fear from your exposure.