In women with regular menstrual cycles, the day of ovulation usually falls on the 14th day before the next menstrual period. The 3 days before and 3 days after the day of ovulation combined are called the ovulation period. Most women will determine ovulation by looking at the cervical mucus. Around the time of menstruation, the cervical mucus is thick, low in volume and feels dry in the pubic area due to low estrogen levels in the body. The closer to the middle of the menstrual cycle, as the estrogen level gradually increases, the amount of mucus gradually increases and becomes thinner and thinner. The closer to ovulation, the clearer and brighter the mucus becomes, like egg white, with a high degree of drawing, and the slippery feeling in the pubic area is most obvious at this time. The last day when this mucus appears is called the “peak day”, which is equivalent to the day of ovulation or the day before ovulation, and the cervical mucus during this period is very favorable for conception, as it protects, enhances the vitality and guides the penetration of sperm. Therefore, in combination with the observation of vaginal discharge, ovulation is within the cycle of 3 days before and 3 days after the day of ovulation. In addition, women should maintain a good mood in their daily life, avoid overworking, and work and rest regularly to maintain a normal menstrual cycle so as to achieve stable ovulation.