I suggest you take a patient look at this first:
/video/vide123899059494888 This is the CCTV 2 program "The Road to Health" and the program "My Contraception, My Choice" on Monday, April 6, 2009. This program focuses on various contraceptive methods, how to calculate ovulation period (safe period) and various precautions in the process of contraception. There are two experts:
An algorithm for calculating the passing date.
That is, each ovulation should be about 14 days before menstruation, so 5 days before ovulation-5 days after ovulation is called "ovulation period". But this method is not very reliable, because most women have irregular menstruation. In contrast, the first two methods are more reliable, but there are some troubles. This paper introduces a simple and reliable calculation method to you, hoping to help you.
The calculation formula is:
The first day of ovulation = the shortest menstrual cycle days minus 18 days.
The last day of ovulation = the longest menstrual cycle minus 1 1 day.
Before using this formula to calculate, I was asked to observe and record my menstrual cycle for 8 times in a row and get the longest and shortest days of my menstrual cycle. The numbers obtained by substituting the above formula indicate the start and end time of female ovulation respectively. The menstrual cycle is calculated from the first day of this menstrual cramp to the first day of the next menstrual cramp. For example, the longest menstrual cycle of women of childbearing age in the first eight months is 30 days and the shortest is 28 days. The replacement formula is:
The first day of ovulation = 28 days-18 days = 10 days; The last day of ovulation = 30 days-1 1 day = 19 days.
That is, this woman's "ovulation period" begins on the first 10 day of this menstrual cramp and ends on the first 19 day of this menstrual cramp.
If you observe that your menstruation is very regular: once every 28 days, then you can set the longest and shortest days of your menstrual cycle as 28 days, and substitute it into the formula to calculate your "ovulation period" as: the first 10- 17 day of this menstrual cramp.
This calculation method is based on the first day of this menstrual cramp to calculate the number of days backwards, rather than the next menstrual cramp to calculate the number of days backwards, so it is not easy to make mistakes. After understanding the "ovulation period", if you want to get pregnant, you can have sex every few months from the first day of the "ovulation period", which is very likely to get pregnant. If you don't want to get pregnant, you must miss the "ovulation period" to have sex.
Commonly used methods to calculate the ovulation period are:
1, cervical mucus observation method (must be done in the hospital).
2. Basic temperature measurement. That is, the body temperature measured after a long sleep (usually in the early morning) and before any activity or speech is the basic body temperature. In general, the basal body temperature of women of childbearing age is lower in the first half of menstruation, and the ovulation period is even lower. It can suddenly or slowly increase by 0.3-0.6℃ within 24 hours to a few days after ovulation.
Therefore, it is best to measure basal body temperature from the first day of menstrual cramps, insist on daily measurement, and use drawing paper records for observation and analysis.
The ovaries of normal women of childbearing age excrete a mature egg every month. After the egg is discharged, it enters the fallopian tube and can generally live for 1-2 days, while the sperm produced by men is continuous. Sperm usually remains active in the female reproductive tract for 2-3 days, and its fertility is between 48 hours. If women have sex for a certain period of time before and after ovulation, there is the possibility of pregnancy. This period of time is called "ovulation period".
It is very important to master this period, on the one hand, it can make couples who are infertile because they missed the ovulation period of women have a great possibility of pregnancy; It can also make couples who don't want to get pregnant temporarily miss the "ovulation period" and have sex without other contraceptive measures to prevent pregnancy.
How to help pregnancy, I suggest you look at this:
/vide/vide1239593178363888 This is the CCTV 2 program "The Road to Health" and the program "Abortion and Infertility" from Monday 65438 to March 2009. This project includes: Professor Wu Shuying, Director of Family Planning Department of Peking University Third Hospital, and Obstetrics and Gynecology Department of Navy General Hospital.