Safe period contraceptive method that you can master by yourself

　　The key to safe period contraception is to know the ovulation period and how to predict the ovulation period. There are many methods at present, and the methods that can be mastered by yourself at home include the following:

　　1. Visual cervical mucus　　

       female Because mature follicles can produce more estrogen, when it reaches a certain level, that is, during ovulation, the cervical glands can secrete more mucus, about 3 to 30 times the usual amount. At this time, the mucus is thin, transparent, less viscous, watery, and easy to be pulled into filaments. It can reach 15-20 cm in length. If you look under a microscope, you can see that the cervical mucus is in the form of fern leaf-shaped crystals. At the same time, women can feel the cervix. It can be seen that the external cervical opening expands outward during ovulation. The original hard cartilage-like texture of the cervix becomes soft, and a large amount of clear, smooth, and elastic mucus flows into the vagina. The vagina contracts and the mucus is discharged out of the vagina on its own. It can be seen that the mucus is thin, smooth, and transparent. The mucus can be stretched into filaments up to 10 cm or more when pinched with the thumb and forefinger. Be careful not to confuse the semen left after intercourse with this mucus. The closer you get to ovulation, the smoother, clearer, and waterier your mucus becomes. If you find an increase in vaginal secretions, that is, an increase in cervical mucus, immediately avoid sexual intercourse or use condoms and other measures, and pay attention to the changes in mucus, and persist until Uterus It takes about 5 to 7 days until the neck mucus becomes smaller and thicker and becomes dry. It is best to record the dates when you notice an increase or change in mucus every month in order to explore the pattern.

　　2. Measure basal body temperature

　　Women's body temperature can change with the menstrual cycle. The body temperature is lower during the menstrual period and follicular phase, while it is higher during the luteal phase. In the first half of menstruation, the temperature is usually above 36.8°C, which is caused by the secretion of progesterone in the body. To predict ovulation, you need to draw a basal body temperature curve. You can use some small square paper and mark the temperature scale at equal distances on the vertical axis of the grid. You can start from 36℃, use 0.1℃ as the grid, and end at 37.5℃, a total of 15 grids. Mark the first, second, third... days of the menstrual cycle on each square on the horizontal axis of the square, and the menstrual period is marked with an X. Starting from the first day of menstruation, after waking up every morning, put the thermometer under the tongue of your mouth before getting up, take it out after measuring for five minutes, and mark the reading on the horizontal and vertical coordinates of the graph paper, represented by black dots. Others urinate into the toilet bowl after getting up every morning, then measure the urine temperature, and record the urine temperature readings on graph paper. Both methods are acceptable. Note that after each temperature measurement, the thermometer should be turned below 36°C for next use. Then, connect the black dots of temperature recorded daily on the graph paper into a curve. Generally speaking, for normal women, their body temperature curve does not change much at first, and their body temperature does not rise significantly until the mid-term. According to Jacques and others abroad, they found that 95% of women's low temperature point occurs within 66 hours before ovulation, 70.4% of which occur 48 hours before ovulation, and the average ovulation time occurs 33 hours after the low temperature point. Therefore, once a low temperature point occurs, sexual intercourse should be avoided or other contraceptive methods should be used. The accuracy rate is generally considered to be 80%.

　　3. Measuring saliva resistance

　　In recent years, it has been discovered that changes in female hormones in the body before and after ovulation can cause changes in electrolytes in saliva. Therefore, the resistance value can change periodically. So some people measure resistance based on this principle to predict ovulation. The method is: spit out some saliva into a container every morning after waking up and before exercising, and measure it with a resistance meter or multimeter. Keep the two measuring rods at a certain distance during the measurement. After measuring the resistance, record the value obtained day by day, and draw a curve like measuring body temperature. After one cycle, it can be found that after the fifth day of the menstrual cycle, the resistance value can have a first peak, and after three consecutive days of low values, a second peak can appear: at this time, ovulation often occurs between the 6th and 9th days after the first peak, so attention should be paid to abstinence or the use of condoms on the 4th to 10th day when the resistance value reaches the first peak. In the same way, some people abroad measured the resistance of the posterior vaginal fornix and found that the lowest day of the month is a signal that ovulation is about to occur. The two methods are more accurate when used together.