The process of fertilization of the egg is very precise and requires the cooperation of various tissues to complete. First of all, the pregnant woman should have enough progesterone in her body. With the effect of progesterone, the normal development and implantation of the fertilized egg can be maintained. Progesterone also promotes the development of the endometrium. The endometrium must be in a secretory phase change under the action of progesterone, thus facilitating the fertilized egg’s implantation. In addition, there is a transparent membrane on the outer layer of the fertilized egg, and the premise of fertilization is that the transparent membrane must disappear. It is recommended that pregnant women avoid strenuous exercise as much as possible during the early stages of pregnancy, as this is not conducive to the fertilized egg’s implantation and can lead to miscarriage of the fertilized egg in severe cases.