How to calculate ovulation when menstruation is irregular?

 　　Correctly grasp the ovulation period, for young people female This is very important: If you want to get pregnant, start from the first day of ovulation and maintain the frequency of sexual intercourse for two days for several months. Unless there are special circumstances, you will generally get pregnant. Women who don’t want to get pregnant need to miss these few days of sexual intercourse. At this time, the ovulation period will be called another term: dangerous period.

　　Southern Medical University Integrated Traditional Chinese and Western Medicine Hospital Gynecology Deputy Chief Physician Zeng Chaoyang said that the period for fertilization after the egg is released from the ovary does not exceed 24 hours.； man's sperm It can maintain fertilization ability for 2-3 days in a woman's reproductive tract, so it is easy to get pregnant during sexual intercourse in the few days before and after the egg is released.

　　“A woman's ovulation date is generally about 14 days before her next menstrual period. For the sake of safety, people call the 5 days before and 4 days after ovulation, including the ovulation day, a total of 10 days as the ovulation period. ”Zeng Chaoyang introduced that the period from the day of menstruation to the day before ovulation begins is the pre-ovulation safety period. From the first day after ovulation to the day before the next menstrual cramps is the safety period after ovulation. “The safety period after ovulation is safer than the safety period before ovulation. ”

　　Menstruation is regular, how to calculate ovulation?

　　Normal women of childbearing age have menstruation once a month. The period from the beginning of this menstrual period to the first day of the next menstrual period is called a menstrual cycle. The ovaries of women of normal reproductive age only release one egg per month. A woman's ovulation date is generally about 14 days before her next menstrual period. Therefore, the easiest way for women with regular menstruation is to calculate the ovulation period based on the menstrual cycle.

　　For example, taking a 30-day menstrual cycle as an example, if the first day of this menstrual period is 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. The ovulation day and the 5 days before and 4 days after it, that is, the ten days from October 10 to 19 are the ovulation period.

　　Irregular menstruation, how to calculate ovulation?

　　Method 1：

　　Calendar method: For women with irregular menstruation, it can be calculated based on the menstrual cycle of the past 6-12 months:

　　The shortest period (number of days) -21 days, forward is the pre-safety period.

　　The longest period (number of days) -10 days, followed by the last safety period.

　　For example, the shortest menstrual period is 28 days and the longest is 37 days. You need to subtract 21 from the shortest menstrual cycle (28-21=7) and subtract 10 from the longest menstrual cycle (37-10=27). Therefore, the 7th to 27th day after menstruation is considered the ovulation period.

　　Method 2：

　　Observe cervical mucus: After menstruation, cervical mucus is often thick and small, or even no mucus at all. This is called the "dry period" and makes it difficult to conceive. In the middle of the menstrual cycle, as endocrine changes occur, mucus increases and becomes thinner, and vaginal secretions increase, which is called the "wet period."

　　Near ovulation, the mucus is clear, smooth and elastic, like egg It is clear, highly stringy, and not easy to break. The 48 hours before and after the last day when this mucus appears is the day of ovulation. Therefore, when the vagina feels wet, it is the "pregnant period". Therefore, for contraception, you need to wait for three days to dry again, and then you can have sex after the fourth night.

　　Method 3：

　　Measure basal body temperature: Women generally ovulate in the process of rising from low to high before basal body temperature rises. The three days when the basal body temperature is at an elevated level is the "fertile stage", and the three days after it is the safe period. This method can only indicate that ovulation has occurred, but cannot predict when ovulation will occur.

　　After waking up after 6 hours of adequate sleep and before doing any activities, measure and record the temperature: Under normal circumstances, the body temperature rises by 0.3℃-0.5℃ after ovulation.℃； If there is no ovulation, the body temperature does not rise and the body temperature remains low throughout the cycle. It is necessary to repeat the test many times and connect the dots and lines on the chart for analysis. ； If your life is irregular, such as night shift, business trip, insomnia, mood changes, disease Wait, this method cannot be used to determine whether ovulation occurs.

　　Reminder: The safety period may not necessarily be safe

　　Zeng Chaoyang reminded that the calendar method (ie, calculation based on the menstrual cycle) is often unreliable. The time when a woman ovulates is affected by the external environment, climate, her mood, and healthy Due to factors such as status, ovulation may be delayed or advanced, and additional ovulation may also occur. “Period contraception is not very safe." The failure rate of contraception during the safe period is about 20%. Relatively speaking, the contraceptive effect of sexual intercourse during the safe period after ovulation is more reliable when measured using the basal body temperature method and the cervical mucus method.