Calculating ovulation and menstrual periods is a very important step in the pregnancy process. Here are some commonly used methods:

2. Calendar method: record the time on the calendar to each day, and then calculate the ovulation period based on the date and day of the week. Generally speaking, ovulation occurs in the middle days of the cycle (that is, every Thursday). However, this method requires accurate recording of the date and day of the week, as well as some knowledge of the calendar.

3. Symptom method: Some women will experience symptoms during ovulation, such as breast swelling, nausea, headache, changes in appetite, etc. These symptoms may disappear within a day or may last for a few hours. If you're not sure whether these symptoms are present, talk to your doctor.

4. Body temperature measurement method: Measuring body temperature can help determine the ovulation period. During the middle days of the cycle, take your temperature every day and record it on a table. When the body temperature rises by 0.3-0.5 degrees Celsius, it is usually the ovulation period. However, this method requires continuous measurement and can only determine the approximate time of ovulation and cannot be precise to one day.