Implantation is the process in which the sperm and egg unite to form a fertilized egg, which lodges in the endometrium and gradually develops into an embryo. The process of fertilized egg implantation is the beginning of pregnancy, and generally most women have no obvious clinical symptoms during fertilized egg implantation, which are not perceived. However, there are still some clinical manifestations that can occur in some women during fertilization, which can be divided into the following categories First, bloody vaginal discharge or a small amount of bleeding. During implantation it is necessary to destroy the local blood vessels of the endometrium to complete the implantation. In the case of a small amount of localized bleeding, this blood can provide nutrients for the development of the fertilized egg, which is gradually absorbed. However, when the bleeding is a little heavier it can happen that the blood is not completely absorbed and is expelled from the uterus, creating vaginal bleeding. Many women worry if this is a miscarriage when it occurs. Generally, this is a physiological phenomenon and does not require special treatment. Second, discomfort in the lower abdomen. Some women may experience lower abdominal discomfort when the fertilized egg is in the womb, which is usually mild. It is important to note that this lower abdominal discomfort also needs to be differentiated from preterm abortion. In summary, most women have no obvious clinical manifestations of fertilized egg implantation. A small amount of vaginal bleeding and lower abdominal discomfort may occur in a small percentage of women.