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First, a calendar can only give you an estimate of your fertile time and doesn't take in account any medications, trauma to your body, illness, stress, etc. that can affect your ovulation.
Second, anytime you have unprotected sex you can become pregnant. Although your estimated fertile window has passed (I assume you meant Oct. 20-23 and not Nov.) you could ovulate late.
If your period is late you can take a pregnancy test. Otherwise I really wouldn't worry about it!