I believe it is 16 days if not you may be pregnant.
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In general, there are 5 to 6 fertile days every month (the day of ovulation and the 5 to 6 days before ovulation). So there are 60 to 72 days a year that a woman has a chance of becoming pregnant.
During an average 28 day cycle a woman is likely to be fertile between days 7-16 - ovulation typically occurs two weeks before menstruation (there may be a live egg present for up to 48 hours), and she is fertile up to a week before ovulation when there is fertile quality cervical mucus present. Unless a woman uses a birth control/conception method such as Fertility Awareness Method or Natural Family Planning there is no way for her to accurately determine when she is fertile, thus another birth control method should always be used in order to avoid unintended pregnancy.
The average menstrual cycle is 28 days. Five days for the menstrual phase (when a woman's endometrium is being expelled, also known as a period), nine days for the proliferative phase (when the endometrium is developing), zero days for ovulation (when a ripe ova, or egg cell, is deposited from an ovary), and fourteen days for the secretory phase (when the endometrium continues to develop.
cervical, thoracic, lumbar and sacral.
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