Thank you for your inquiry. From what we gather from the question, you were asking about the accuracy of a rapid point-of-care (POC) test. The rapid point-of-care (POC) test has an accuracy of 99.6%.
The window period of this test is 4 weeks to 3 months (although up to 95% of infections are detectable within 4-6 weeks). Most people develop detectable antibodies in 21-25 days. With you taking the test at 16 and 21 weeks later (4-5 months later ) you can consider the test conclusive to be negative (1).
Recommendation: Refer to a healthcare professional for more personalized answers.
AIDS Vancouver Helpline/Online, Sonali
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1. Rapid Testing