Last month 8 to menstruation, if a woman’s menstrual cycle is 28 days to come once, ovulation is the last month of the 22nd or so, if a woman’s menstrual cycle is 30 days to come once, ovulation is the last month of the 24th or so. A woman will have her period 14 days after ovulation when the egg is not fertilized. The chances of pregnancy are high when a woman has intercourse on the day of ovulation and a few days before and after the day of ovulation, while in the rest of the time no ovulation occurs, and even if there is sexual intercourse, pregnancy is usually not possible. In many cases, ovulation may occur a few days earlier or later due to mental stress, changes in living conditions, and work pressure. Therefore, if women want to accurately detect ovulation, it is best to live a regular life through the menstrual cycle projection, using ovulation test paper and dynamic ultrasound detection, combined examination is more accurate.