Thank you for your inquiry. From what we gather from the question, you were asking about the potential relationship between HIV and a throat infection with swollen glands three days after engaging in unprotected insertive sex while on PrEP. From the information given, this scenario is determined to be High Risk (there is evidence of transmission through these activities and are the majority of cases of transmission).
The scenario mentioned above does meet the three components of the transmission equation. It is very responsible of you to use PrEP when engaging in risky behaviour such as unprotected insertive sex. It is important to note that even if you take PrEP exactly as prescribed it is not 100% effective at preventing HIV transmission, and thus other safe sex initiatives, such as using condoms, should also be considered in the future (1). It is unlikely that the symptoms your doctor noticed 3 days post-exposure are due to a new HIV infection, as it typically takes up to 2 weeks for symptoms to develop. Please note that since you are on PrEP it is recommended for you to access regular quarterly HIV and STI testing (2).
Recommendation: Refer to a health care provider for regular quarterly HIV testing.
AIDS Vancouver Helpline/Online, Marie
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1) Oral Pre-Exposure Prophylaxis
2) Testing for HIV in the Context of PrEP