How to calculate your menstrual cycle

　　female The menstrual cycle, or a woman’s menstrual cycle, follows her for decades, starting in puberty. Many women who are preparing for pregnancy or contraception hope to find their ovulation and safe periods by calculating their menstrual cycles, so as to achieve the purpose of pregnancy or contraception. But in fact, it is not easy to calculate. Here are 5 points to note:

　　First of all, the female menstrual cycle is divided into two stages: ovulation period and menstrual period. It is generally divided into dangerous period, safe period and menstrual period. The dangerous period refers to the period when ovulation is possible.

　　1. The ovulation period usually lasts 10 days.

　　Ovulation is usually 14 days before the next menstrual period.

　　Because the ovulation period is uncertain, generally the first 5 days and the last 4 days, including the ovulation day, are considered the ovulation period. Avoid even the most adventurous sperm And the egg cells generally survive for 72 hours, which is the so-called minimum safety period of 3 days.

　　2. The time excluding the ovulation period and menstrual period is the safe period.

　　For a woman with a regular menstrual cycle of 28 days, the first day of this menstruation is September 1st, and the first day of the next menstruation will be September 29th. The ovulation day is September 15th. Calculated based on the 4 days before and 5 days after the ovulation day, the ovulation period is September 10-19. After exclusion, the safe period for this woman is from the end of menstruation on September 6 to September 10 (commonly known as the pre-ovulation safety period), and from September 19 to September 28 (commonly known as the post-ovulation safety period).

　　3. The safety period after ovulation is safer than the safety period before ovulation.

　　The day of ovulation is greatly affected by a woman's mood and environment and is easily advanced, so the safety period before ovulation can easily expire without being noticed.

　　Women rarely ovulate twice in one cycle. Generally, the second ovulation will not occur between ovulation and the next menstrual period. Therefore, the safety period after ovulation is safer.

　　4. The safety period for the first seven and the last eight cannot be generalized.

　　There has been a popular saying that the seven days before menstruation and the eight days after menstruation are safe periods. But this calculation method is only applicable to women whose menstrual cycle is 28 days and is stable for a long time.

　　5. The contraceptive failure rate during the safe period is generally high

　　Because women’s menstrual cycle is easily affected by personal emotions, disease It generally has a failure rate of about 20% and is affected by the surrounding environment. It is related to human life. Women are generally not encouraged to use this method for contraception.

　　In addition, the menstrual cycle is less than 21 days, more than 35 days, and Postpartum Women who are breastfeeding or breastfeeding cannot use this method of contraception.

　　However, if you are a woman who is trying to conceive and want to have a baby, you can increase your chances of getting pregnant by calculating your ovulation period.