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 vaginal sex and the accuracy of the OraQuick test you accessed 30 days 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 lapse in the protective barrier, then it is possible that vaginal fluids containing the HIV virus could have gained direct access to your bloodstream through your urethra.
Wearing a condom is a great way to reduce the risk of acquiring STIs, but it does not completely eliminate the risk. It was very responsible of you to access HIV testing after engaging in a risky activity. The average window period of the OraQuick test is 12 weeks, and after 12 weeks the test will accurately detect 98% of HIV infections (1). Although home-tests such as OraQuick are an easy way to test for HIV, they are slightly more likely to show a false result. With this in mind, it is recommended to access a 3rd or 4th Generation HIV test from a laboratory 12 weeks post-exposure for completely conclusive results.
Recommendation: Refer to a health care provider for HIV testing 12 weeks post-exposure for completely conclusive results.
AIDS Vancouver Helpline/Online, Marie
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1) HIV Testing Technologies