Thank you for your inquiry. From what we gather from the question, you were asking about the window period of a nucleic acid amplification test (NAT or NAAT) after a possible HIV exposure.
A NAAT test can detect the presence of the HIV virus as early as 7 to 14 days post-exposure (1). The test you accessed may have given you an accurate negative result, but it is important to get re-tested with an antibody test outside of the window period for conclusive results. Most guidelines and physicians recommend re-testing 3 months post-exposure with an antibody test for completely conclusive results.
Recommendation: Refer to a health care provider for an HIV antibody test outside of the window period after engaging in a low or high risk activity.
AIDS Vancouver Helpline/Online, Marie
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1) HIV Testing Technologies