How is it done to monitor ovulation at the hospital?

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 content, with the carriage returns remaining unchanged and all other Chinese text translated into English:
1. The cervical mucus method: In the gynecology department of a hospital, cervical mucus is examined to determine if a woman is in her ovulation period.
2. The basal body temperature method: Measure your temperature every morning after waking up. Generally, your temperature is lower in the first half of the cycle, drops further during ovulation, and then gradually rises afterward.
3. The menstrual cycle calculation method. Many women do not know exactly when their ovulation period occurs. Using the formula below, after some testing over time, it is easy to calculate.
The formula is as follows:
First day of ovulation period: Cycle days minus 18
Last day of ovulation period: Cycle days minus 11