A woman's menstrual cycle usually occurs once a month, and ovulation is the time during the menstrual cycle when a woman's eggs are released from the ovaries and enter the fallopian tubes. For many women, ovulation is an important time when planning a pregnancy. However, for some women, they may not know their menstrual cycle and therefore not know when their ovulation is.

So, what is ovulation? Ovulation refers to the time in a woman’s menstrual cycle when a woman’s eggs are released from the ovaries and enter the fallopian tubes. Generally speaking, the survival time of eggs is limited during a woman's menstrual cycle, usually within 48 hours. On day 14 of the menstrual cycle, women typically begin to see clear eggs that need to be fertilized before they can pass into the fallopian tubes. On the 15th day of the menstrual cycle, a woman's eggs will begin to die and enter the fallopian tubes to await fertilization.

So, how to determine your ovulation period? Generally speaking, you can determine your ovulation period through the following methods:

1. Record your cycle: You can learn about your cycle by recording your menstrual date and cycle time.

2. Watch for symptoms: Some women may feel uncomfortable during ovulation, such as headaches, breast pain, and abdominal pain.

3. Use test paper: You can use test paper to detect your basal body temperature and body temperature changes during the menstrual cycle to determine your ovulation period.

4. Observe your body changes: On the 14th and 15th days of the menstrual cycle, women's bodies may experience some changes, such as breasts becoming softer, appetite increasing, sexual desire increasing, etc.

While these methods can help women determine when they are ovulating, they don't work for everyone. So if you're unsure about your menstrual cycle or don't want to use these methods, talk to your doctor.