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 text, with line breaks preserved as instructed:
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 cycle length calculation method. Many women do not know exactly when their ovulation period occurs, but by using the following formula and testing for a period of time, it can be easily calculated.
The calculation formula is:
First day of ovulation period: Cycle length in days minus 18 days
Last day of ovulation period: Cycle length in days minus 11 days