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Negative test on day 36...today is October 11. Unprotected intercourse on September 18 and 24...

It is difficult to determine the exact reason for the delay in your cycle without more information. Factors such as the reliability of the pregnancy test used, the timing of the test, and the possibility of late ovulation could all play a role. It may be helpful to consider using a more reliable pregnancy test or ovulation test to get a clearer understanding of your fertility window.