HIV testing guidelines recommend retesting at 3 months (12 weeks) post-exposure for conclusive results, as this allows sufficient time for the body to produce detectable levels of antibodies or viral RNA if infected. While fourth-generation HIV tests can detect HIV infection earlier than previous tests, they may not always detect the virus within the first few weeks after exposure. The HIV RNA test is highly sensitive and can detect the virus sooner than antibody tests, but it's still recommended to confirm negative results with another test after the window period.
Therefore, while your negative results at 33 days (fourth-gen test) and 35 days (RNA test) are encouraging, they are not considered conclusive. It's important to follow up with another HIV test at the recommended time frame of 3 months post-exposure for a definitive result. In the meantime, practicing safer sex and taking precautions to prevent potential transmission is advisable. If you have concerns or questions, it's always best to consult with a healthcare professional for personalized advice.