The first few days of ovulation are an important period for pregnancy. If a woman has sex during ovulation and sperm successfully enters her body, she may become pregnant. However, only when a woman releases mature eggs can sperm combine with the eggs and become pregnant.

In addition, women can determine their ovulation period by observing their symptoms. For example, women may feel an increase in sexual desire and may have mild mood swings. These symptoms usually appear during a woman's ovulation period.

To sum up, women can determine their ovulation period by measuring their basal body temperature and observing their symptoms. If a woman has sex during ovulation and sperm successfully enters her body, she may become pregnant.