经期25天排卵是哪一天
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Fertile dates
The average normal duration of a menstrual cycle is 28 days. The first day of a woman’s menstrual period is considered to be Day 1 of her menstrual cycle. Ovulation is anticipated to occur 14 days before the next period is due to start. Her fertile period would be from five days before predicted ovulation up until 1–2 days after ovulation. For example,in a woman whose cycle is 28 days long,ovulation would be assumed to occur on Day 14. The woman’s fertile period would therefore occur between Days 9 and 16 of her menstrual cycle. This creates a seven-day window. This may be narrowed down to a peak fertile window of four days if the couple would like to minimise risk exposure further. This would be calculated as two days before predicted ovulation,the day of ovulation and one day after predicted ovulation.
However,menstrual cycle length may differ considerably between women and may even differ from month to month for an individual woman. It is therefore essential that a woman keeps a record of her menstrual cycle (typically taking into account the first day of her menstrual period) in order to determine an average menstrual cycle length. It is important to explain to patients that regular menstrual cycles may not necessarily indicate that ovulation has occurred. Ovulation is less likely to be occurring in women whose cycle is 24 days or less or 35 days or longer. There are now several mobile phone applications that are available for free that can assist women to keep track of their cycles and to predict ovulation. This can be a very helpful resource. Examples include CycleBeads™ and Dot™. It may take up to four months to establish an average cycle length where cycles are irregular and the more months that are recorded the more accurate the timing can become when using this method.","department":"
