The menstrual leave on the 1st and the 6th are the fertile days?

Women's menstrual cycles can be long and short, but the interval between the day of ovulation and the start of the next menstrual period is relatively fixed, usually around 14 days. The calculation method is calculated from the first day of the next menstrual period, and the 14 days backward or subtracted 14 days is the ovulation day, and the ovulation day and the first 5 days and the last 4 days together are called ovulation. For example, if a woman's menstrual cycle is 28 days, and the first day of this menstrual period is on December 2, then the next menstrual period will be on December 30 (December 2 plus 28 days), and then subtract 14 days from December 30, then December 16 is the day of ovulation.

Ovulation is the day of ovulation and the 5 days before and 4 days after, that is, from December 11 to 20. In addition, in the menstrual cycle, except for the menstrual period and ovulation period, the rest of the time is the safe period, so in the menstrual cycle, there is a pre-ovulation safe period and a post-ovulation safe period. In fact, this is also the theoretical basis of the rhythm contraceptive method.

However, to calculate the ovulation period with this method, we must first know the length of the menstrual cycle, so as to calculate the accurate time of the next menstrual cramp, and then to calculate the ovulation period, so this method can only be applied to women who have always had a normal menstrual cycle. For women with irregular menstrual cycles, it is impossible to calculate the date of the next menstrual period. Therefore, it is not possible to calculate the date and period of ovulation.

The first three days and the last four days of the 15th are dangerous periods.

Ovulation is closely related to a woman's menstruation, so the ovulation algorithm is slightly different depending on the menstrual situation.

1) When women have regular menstruation.

The ovulation period is generally 5 days before the ovulation date - 4 days after the ovulation day, including the day of ovulation. The day of ovulation is about 14 days before the next menstrual period.

Your menstrual date is January 10th, and your menstrual cycle is 30 days, then the next menstrual date is February 9th, the ovulation day is January 26th, and the ovulation period is: January 21st - January 30th.

2) When a woman's menstrual cycle is irregular.

It is difficult to ** the date of your next menstrual period, so if you want to estimate the ovulation period, you can calculate it like this:

The first day of ovulation = the number of days of the shortest menstrual cycle - 18, the last day of ovulation = the number of days of the longest menstrual cycle - 11, ps: from the first day of menstruation.

For example, the shortest menstrual cycle is 28 days, and the longest is 39 days. Then the first day of ovulation = 28-18 = 10, and the last day of ovulation = 39-11 = 28, which means that the 10th to 28th days of the menstrual cycle belong to the ovulation period, so the ovulation period is:

November 10th - November 28th.