, I am glad you reached out with these questions. We are not medical professionals, but I can give you some information that may be useful. It sounds like you are looking for information about transmission risk and making the choice if you should start PEP.
HIV can be transmitted through some bodily fluids like cum/semen like you mentioned. In the case of transmission through oral sex, the risk is at the lower end of the spectrum compared to unprotected vaginal or anal sex. You can definitely learn more about the specifics which may ease your mind through this article: https://h-i-v.net/transmission.
In terms of PEP, here is an article on PEP and how it works: https://h-i-v.net/pep. As this article outlines, you would begin taking PEP up to 72 hours following a potential exposure.
You can find more info on other types of tests here: https://h-i-v.net/test-types.
Please keep us posted on how you are doing, and I hope this information can help you.
Best,
Liz (Team Member)