There are no symptoms after the formation of the fertilized tube. Both the sperm, the egg and the fertilized egg are at the stage of germ cells, which are very tiny and invisible to the naked eye, so the formation of the fertilized egg will not lead to corresponding symptoms in the clinic. Only when the fertilized egg enters the uterine cavity and settles in the uterus, leading to changes in hormone levels in the body, will corresponding clinical symptoms appear, and most of the fertilized egg will only appear after ten days after it has settled in the uterus. Because the trophoblast cells begin to secrete blood HCG after the fertilized egg is deposited, the amount of blood HCG and estrogen will gradually increase, which will cause the corresponding symptoms in the body, such as nausea, vomiting, anorexia, breast enlargement, and breast localized slight pain and so on.