For most women of reproductive age, the difference between the left follicle and the right follicle is mainly in the ovulation period, during which the ovary grows and develops, and the phenomenon of having follicles expel eggs occurs, usually alternating between the left and right sides. In this case, the right follicle has not developed significantly. By the difference in growth and development between the left and right follicles, it can be clearly determined whether the left follicle expels the eggs or the right follicle expels the eggs. The probability of conception can be significantly improved by choosing the right time for sexual intercourse according to one’s physical condition and with clear ovulation.