Knowing your ovulation period is important when planning a pregnancy. During ovulation, a woman's egg is released from the ovary and travels through the fallopian tube into the uterus, where it is ready to combine with sperm to form a fertilized egg. If a woman is fertilized during this period, the fertilized egg will be implanted in the uterus within 24 hours and embryonic development will begin.

1. Observe the menstrual cycle: Understanding a woman’s menstrual cycle is very important to determine ovulation. Usually, a woman's menstrual cycle lasts about 28 days, and ovulation usually occurs between the 14th and 20th days of the menstrual cycle.

2. Use a pregnancy test stick: A pregnancy test stick can detect whether there are eggs in a woman's body and determine the ovulation period. Generally, the higher the sensitivity of the pregnancy test, the more accurate the test will be.

3. Observe body temperature: A woman’s body temperature also changes with the ovulation period. Usually, before ovulation, a woman's body temperature will rise by 0.3 to 0.5 degrees Celsius, and after ovulation, the body temperature will drop again.

4. Watch your sexual desire: During ovulation, a woman’s sexual desire may increase. This may be due to the release of eggs and entry of sperm, causing women to be more sensitive and aroused.

To sum up, understanding ovulation requires a combination of methods, including observing the menstrual cycle, using a pregnancy test stick, observing body temperature, and observing sexual desire. If a woman is fertilized during her ovulation period, then planning a pregnancy requires more care and seriousness.