After intercourse during ovulation, if the egg can be successfully fertilized to form a fertilized egg and the fertilized egg can be successfully laid, it means that the pregnancy is successful, which is characterized by the following: a. After the fertilized egg is successfully laid, the most early and main feature is that the menstrual flow which is usually regular no longer comes, and the symptoms of menopause appear; b. During the process of fertilization of the fertilized egg, some women may experience slight discomfort in the lower back and lower abdomen The symptoms include increased sensitivity of the nipples and nipple swelling; 3. Due to the change of sex hormone level during pregnancy, individual women may experience fatigue, lethargy and drowsiness; 4. A few women may experience a small amount of bleeding during fertilization of the fertilized egg.