Ovulation day, that is, the date on which the egg is discharged, after a woman’s egg is discharged from the ovary, it can survive in the fallopian tube for about 1-2 days to wait for fertilization. Generally, 4 days before plus 5 days after the day of ovulation, plus the day of ovulation, a total of 10 days, clinically known as a woman’s ovulation period, during which coitus is more likely to conceive. In the case of normal menstruation, i.e., women with regular menstrual cycles, the day of ovulation is usually 14 days before the next menstrual period. If the menstrual cycle is not regular, it is impossible to calculate the exact day of ovulation, these women can determine the day of ovulation by monitoring the basal body temperature, ovulation test paper test, and monitoring the development of follicles under the vaginal ultrasound. Specific monitoring methods are as follows: 1, basal body temperature monitoring: mainly to measure the body temperature in the early morning when waking up, body and mood in a calm state. Generally, the basal body temperature on the day of ovulation is the lowest, and the basal body temperature can rise 0.3℃-0.5℃ after ovulation; 2, ovulation test paper monitoring: that is, about a week after the end of menstruation, use ovulation test paper to detect once a day. If you find that the ovulation test paper strong positive gradually enhanced, to strengthen the frequency of detection, it is best to test every 4 hours. If you compare the test paper and find that the ovulation test paper begins to weaken and turn weak rapidly, it means that ovulation is about to take place; 3, yin ultrasound monitoring: yin ultrasound under the follicle diameter reaches more than 18mm, generally follicle maturity ovulation occurs in about 10 hours, this time is also the day of ovulation. In addition, because the menstrual period is about 3-7 days, everyone is different, so the exact time of the day of ovulation, before and after there may be differences. Therefore, if you need to accurately calculate the day of ovulation, it is generally recommended that you choose one of the above methods to monitor ovulation.