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 line breaks kept as they are:
First is the cervical mucus method, in which a gynecological examination is conducted in a hospital to check the cervical mucus to determine if it is the ovulation period.
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 of their cycle is ovulation day. Using the formula below, after some testing over 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