How 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 line breaks remaining as they are:
"First is the cervical mucus method, which is performed in a gynecological department of a hospital to determine if a woman is in her ovulation period by examining cervical mucus.
Second is the basal body temperature method: Measure your temperature every morning after waking up. Generally, your temperature is lower in the first half of the day, drops further during ovulation, and then gradually rises afterward.
Third is the menstrual cycle calculation method. Many women do not know exactly which day their ovulation period falls on. By using the formula below and testing for a period of time, it is easy to calculate.
The calculation formula is:
First day of ovulation period: Cycle days minus 18 days
Last day of ovulation period: Cycle days minus 11 days"