When the sperm and the egg unite, the woman will react in a certain way. What are the obvious reactions to sperm-egg union. The first one is that the basal body temperature will drop, some women will have bleeding from the lower body, and individual pregnant mothers will have cramps. After the fertilized egg is laid, some women may experience a small amount of bleeding from the lower body and even cramps. Some women will have a small amount of bleeding at the onset of menstruation, which is not a sign of physiology, but a result of the fertilized egg’s implantation. Second, the nipples will be swollen and painful to the touch. After the fertilized egg is laid, certain hormonal changes will occur in the woman’s body, which will lead to a swollen and painful sensation in the breast. If a woman’s breasts feel swollen and tingly, it is normal that she should be pregnant. Thirdly, you will feel tired, sleepy and weak. This is because the fertilized egg will secrete a lot of hormones after it is laid, and you will feel weak and drowsy, as if you have a cold, and many pregnant women will have this symptom. Fourth, after the fertilized egg is laid, the metabolism of women will undergo certain changes, which will stimulate the female body to urinate frequently, so the number of trips to the toilet will greatly increase.