How to go to the hospital to monitor ovulation

Patient's question:

Patient gender: Female
Patient age: 30
How to monitor ovulation at the hospital

Doctor's answer:

Here is the English translation of the provided text, with the line breaks kept as they are:
First, the cervical mucus method: In the gynecology department of a hospital, cervical mucus is examined to determine if one is in the ovulation period.
Second, the basal body temperature method: Measure your temperature every morning after waking up. Generally, the temperature is lower in the first half of the day, and it drops even lower during ovulation, then gradually rises afterward.
Third, the menstrual cycle calculation method. Many women do not know exactly which day their ovulation period is on, but by using the formula below and testing for a period of time, it can be easily calculated.
The calculation formula is:
First day of ovulation period: Cycle days minus 18 days
Last day of ovulation period: Cycle days minus 11 days