I am glad you reached out because I am sure it has been stressful tackling these questions. We are not medical professionals and cannot advise you about your personal test results, but I can give you some information that may be useful. As it seems you know, 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.
Regarding your testing, you mentioned the window period (these vary based on the test). Typically, people may experience an incorrect result if an HIV test is taken within the first 2 months of a possible exposure; this period of time is called the "window period". However, outside window period (and day 104 would be about 3 months I think), false-negatives are rare. For more information, see here: https://www.aidsmap.com/about-hiv/false-negative-results-hiv-tests.
It sounds like despite the negative results you are still concerned. I personally am a big believer in talking things out with a therapist, although I know it isn't for everyone! I know other advocates here have written a great deal on the subject. I like what shares in this article: https://h-i-v.net/living/find-therapist
I hope this helps. Please keep us posted on how you are doing, we're here for you.
- Liz (Team Member)