When the sperm and egg are first united, clinically there are no symptoms because both are reproductive cells and are very small, even if the fertilized egg is formed, it is very small and therefore does not cause symptoms. In case of pain in the lower abdomen, vaginal bleeding or other uncomfortable sensations, which are not clinically caused by the union of the sperm and egg, but by other pathological conditions, it is recommended to go to the hospital for the appropriate examination and treatment without delay. In addition, it is also recommended to have intercourse during the planning of pregnancy, around the time of ovulation, when the sperm and egg are combined, and to strengthen nutrition in the clinical diet, which will be more conducive to eugenics, and it is also recommended to stay away from smoking and alcohol during this period, to ensure a good lifestyle and to ensure sufficient sleep.