Are the first seven and the last eight safe or dangerous periods? The truth is this

　　Are the first seven and the last eight periods a safe period or a dangerous period? Presumably many women are very concerned about this issue, but in life, most women do not understand the term "first seven, last eight", which leads to failure in calculating the safe period. Women who want to correctly calculate the safety period must understand this issue in time. Next, we will introduce it in detail female safe period The relevant knowledge is for your reference.

　　Are the first seven and the last eight safe periods or dangerous periods?

　　The safe period for adult women is seven days before menstruation and eight days after menstruation. The period from the day when menstruation begins to the day before ovulation begins is the pre-ovulation safety period, which is generally 8 days, which is the last 8 days. From the first day after ovulation to the day before the next menstrual cramps is the safety period after ovulation. Generally it is 7 days, which is the first 7 days.

　　In addition, the first seven and the last eight are a method used to calculate the safe period. The first seven refer to the seven days before menstruation, while the last eight refer to the eight days starting from the first day of menstruation. It should be noted that the last eight days do not refer to the eight days after the end of menstruation. For example, if a woman starts menstruation on September 20 and ends on September 26, then the first seven days refer to the seven days starting from September 13, and the last eight days refer to the eight days before September 27, that is, the period from September 13 to September 27 is the safe period for the woman.

　　We call the 5 days before and 4 days after ovulation, including the ovulation day, the ovulation period. After the egg is released from the ovary, it can survive in the fallopian tube for 1 to 2 days, waiting for fertilization.； man's sperm It can remain fertilized in a woman's reproductive tract for 2 to 3 days, so it is easier to get pregnant during sexual intercourse in the days before and after the egg is released. To be on the safe side, we add the 5 days before and 4 days after the ovulation day, plus the survival time of the man's sperm, to get what we call the 7 days before and 8 days after the ovulation period.

　　However, the first seven and last eight days of a woman's safe period should be determined according to the menstrual cycle. This method of calculating the safe period is generally suitable for women with a menstrual cycle of about 28 days and regular menstruation. If a woman's menstrual cycle is less than 26 days, generally speaking, the first seven days can still be calculated as safe periods, while the last eight days are not applicable. Contraception during the safe period will also be affected by factors such as mood, climate, environment, etc. Ovulation may occur early, delayed or even extra ovulation, so contraception during the safe period is not absolutely safe.

　　What is the absolute safety period?

　　absolute safety period It refers to the 1st to 7th day of the menstrual cycle and the last 4 to 5 days of the cycle. During this period, ovulation has not occurred or the egg has died, so even if the ovulation date changes, it is an absolutely safe day. It can be said that the safe period for women is also a very important time period.

　　From the perspective of contraception, a menstrual cycle is divided into three periods: an absolute safe period, a safe period and a dangerous period. Assuming that a menstrual cycle lasts 28 days (from the first day of menstruation to the first day of next menstruation), ovulation occurs around day 14. The 3 to 5 days before and after ovulation are the fertile period and the dangerous period for contraception. ； Days 1 to 7 and the last 4 to 5 days of the cycle indicate that ovulation has not occurred or the egg has died, which is an absolutely safe period. ； The remaining days are a relatively safe period, because ovulation may be affected by many factors to advance or delay a few days, so it is called relatively safe. If you have intercourse during an absolutely safe period, it is almost impossible to get pregnant unless there are very special circumstances, that is, ovulation occurs twice or more in one cycle. ； If you have sex during a relatively safe period, the chance of contraceptive failure will be greater.

　　How to calculate the safe period for women?

　　1. Basal body temperature method

　　Basal body temperature is healthy The body temperature of a person after waking up in the morning is generally the lowest body temperature of the day. In women of normal reproductive age, the body temperature rises immediately after ovulation and continues until the beginning of the next menstrual cycle. Use the changing pattern of a woman's basal body temperature to find her ovulation period, and refrain from sexual intercourse 3 to 4 days before and 5 to 7 days after it.

　　2. Ovulation test paper method

　　The luteinizing hormone (LH) in a woman's urine will peak 24 to 48 hours before ovulation. The use of ovulation test strips can more accurately detect the peak level of LH. Pregnancy can be avoided by avoiding sexual intercourse 3 to 4 days before and 5 to 7 days after the LH peak is detected.

　　3. Calendar method

　　If the menstrual cycle is always accurate, ovulation may occur on the 14th day after menstruation. After egg cells are released, they can survive for about 2 to 5 days, and sperm can survive for 1 to 3 days after entering the female reproductive tract. Therefore, 3 to 4 days before ovulation and 5 to 7 days after ovulation, both men and women can avoid pregnancy by not having sexual intercourse.

　　The three types introduced above How to calculate the safe period for women , what do you think? Women who want to know more about women’s safe periods must read it carefully.