If I have 2 menstruations in 1 month, is the 2nd period considered a safe period?

Many women don't know exactly what day they are ovulating, and using the following formula, after a period of testing, it is easy to calculate.

For those with a normal menstrual cycle:

Ovulation in women is affected by the endocrine hormones of the pituitary gland and ovaries and presents cyclical changes, the length of the cycle is the same, both are 1 cycle per month, and ovulation occurs in the middle of two menstrual periods. 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. Then according to this relationship between ovulation and menstruation, the ovulation period can be estimated according to the menstrual cycle.

The estimation method is to count from the first day of the next menstrual period, and the 14 days backward or minus 14 days is the ovulation day, and the ovulation day and the first 5 days and the last 4 days together are called ovulation. This is also the rationale for the rhythm method, because the rest of the menstrual cycle is the safe period, except for the menstrual period and ovulation.

For example, if the menstrual cycle is 30 days, and the first day of this menstrual period is on September 29, then the next menstrual period will be on October 29 (September 29 plus 30 days), and then subtract 14 days from October 29, then October 15 is the day of ovulation. Ovulation is the day of ovulation and the first 5 days and 4 days after it, that is, from October 10 to 19.

To calculate the ovulation period in this way, we must first know the length of the menstrual cycle, that is, there must be a very normal or regular menstrual cycle in order to calculate the start date of the next menstrual period and then calculate the ovulation period, so it can only be applied to women who have a normal menstrual cycle. If the menstrual cycle is irregular or abnormal, it is not possible to calculate the date of the next menstrual period, so it is not possible to calculate the date and period of ovulation.

For irregular menstruation, the formula for calculating ovulation is:

The first day of ovulation The number of days of the shortest menstrual cycle minus 18 days;

The last day of ovulation The number of days of the longest menstrual cycle minus 11 days.

For example, if the menstrual period is a minimum of 28 days and a maximum of 37 days, it is necessary to subtract 18 (28 18 10) from the shortest regular period and 11 (37 11 26) from the longest regular period, so the 10th to 26th days after menstrual cramps are considered ovulation.

Your menstrual cycle is very irregular. If you're an adult, you should take a look and tune in. It's also a bit abnormal if you're an adult. It's not normal to come twice in a month. You should also go to the hospital for a visit.

Second: You don't need to take birth control pills.

Third: it should not be counted as such. It should be counted from the first day of the second menstrual period. Calculated as normal.

It's not normal, go to the doctor and adjust the menstruation!

To put it mildly, 1 week after menstruation and 1 week before menstruation are considered safe periods, but they are not 100% contraceptive!

Counted from the last menstrual period.

Hello, 7 days before and 8 days after the menstrual period is the safe period of women's physiology, that is, the non-ovulation date, in addition to the possibility of pregnancy.

Advice: Rhythm contraception is not 100% safe and should only be used as a reference. In order to improve the quality of sexual life, this method may be considered for women with regular menstrual cycles.

Absolute safe period. Generally, the first seven and eighth days of menstruation are the safe periods.