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.
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The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.
Usually up to two weeks.
It may last for one week or so..
None, some days are more likely than others but nona are safe.
Typically menstruation lasts for between 5-7 days. Everyone is different so some women may have shorter or longer periods, also menstrual phases are never exactly the same so days may vary from one cycle to the next.