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, 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 and even lower during ovulation, then gradually rises after ovulation.
Third is the cycle length calculation method. Many women do not know exactly when their ovulation period is, but by using the following formula and testing over 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