Thank you for your inquiry. From what we gather from the question, you were asking about the risk of acquiring HIV after engaging in protected insertive sex and the accuracy of the test results you accessed post-exposure. From the information given, this scenario is determined to be Low Risk (evidence of transmission occurs through these activities when certain conditions are met).
The scenario mentioned above could meet the three components of the transmission equation if the condom was not used properly, or if it broke during sexual activity. If there was a break in the protective barrier, then it is possible that bodily fluids containing the HIV virus could have gained direct access to your bloodstream through your genitals.
It was very responsible of you to access HIV testing after engaging in a risky activity. The HIV RNA PCR test you accessed can detect an active HIV infection as early as 7 to 14 days post-exposure, with an accuracy of ~90% (1). Follow-up antibody testing after 12 weeks is typically recommended for completely conclusive results. With this in mind, the non-reactive 4th generation test you accessed on April 8th would be considered completely conclusive, as well as the non-reactive 3rd generation test you accessed on August 7th.
Recommendation: Since HIV testing has been accessed outside of the window period, no further HIV testing is required. Refer to a health care provider for other health related questions.
AIDS Vancouver Helpline/Online, Marie
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1) HIV Testing Technologies