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 gynecology 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 drops further during ovulation, then gradually rises afterward.
Third is the menstrual cycle calculation method. Many women do not know exactly which day they ovulate, but by using the following formula and testing over a period of time, it is easy to calculate.
The calculation formula is:
First day of ovulation period: Cycle days minus 18
Last day of ovulation period: Cycle days minus 11