Okay, here is a Chinese article with the title "When is the menstruation period on the 7th, what is the ovulation date?":

Generally speaking, if you have a regular menstrual cycle, your ovulation will usually occur on the 14th day before your next period. However, if your menstrual cycle is less regular, your ovulation days may vary.

Additionally, there are measuring tools you can use to determine when you are ovulating. For example, you can use a thermometer to measure your temperature, or use a calendar app to record your temperature changes and dates.

No matter which method you use, knowing your ovulation period can help you plan your pregnancy better and help you get pregnant at the optimal time. If you have any questions, please consult your doctor or professional advisor.