The number of ovulation on the 7th is related to the regularity of menstruation, the specific number of days in the menstrual cycle, the number of days in the month, etc. It needs to be analyzed on a case-by-case basis and cannot be generalized. If a woman has a regular menstrual cycle and has a period once every 30 days, and she has her period on the 7th of this month and there are 30 days in the month, the next period will be on the 7th of the following month. Ovulation usually occurs on the 14th day before the next menstrual period, which is around the 23rd day of the month. And the ovulation period is usually 5 days before and 4 days after the ovulation day, a total of 10 days, so the ovulation period is on the 18th-27th of this month. However, if you are a woman with irregular menstrual cycle, you cannot project ovulation according to the above method. You can go to the gynecology department of a regular hospital for ultrasound monitoring of ovulation. If you are a woman of childbearing age and you are planning to get pregnant, you can arrange intercourse during the ovulation period, which can improve the chance of pregnancy.