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The average menstrual cycle lasts 28 days. But normal cycles can vary from 21 to 35 days. The amount of time before ovulation occurs is different in every woman and even can be different from month to month in the same woman, varying from 13 to 20 days long.he average menstrual cycle lasts 28 days. But normal cycles can vary from 21 to 35 days. The amount of time before ovulation occurs is different in every woman and even can be different from month to month in the same woman, varying from 13 to 20 days long.
You are at your most fertile the day you ovulate and the day before (generally 12-16 days before your next period starts). So if you have a short cycle, say 20 days, it's likely you'll ovulate well before day 14, and likewise if your cycle is long, say 35 days, you are more likely to ovulate around day 20. So the 'day 14' rule is a 'textbook truth' â for those women whose cycles match the textbook idea of 28 days every time!