Symptoms of pregnancy in the first week mainly include changes in menstruation, nausea, vomiting, dizziness, drowsiness and changes in eating habits. After pregnancy, the increased levels of various sex hormones such as human chorionic gonadotropin, progesterone and estrogen in the body of a pregnant woman may have an obvious effect on menstruation, which may cause menopause; it may also have an effect on the digestive system, which may cause nausea and vomiting; and there may be other symptoms such as drowsiness, fatigue, lethargy, weakness, dizziness, headache, and changes in eating habits. As the physical condition of each pregnant woman is different, the severity of the above symptoms of early pregnancy reaction varies. Some pregnant women may not have obvious early pregnancy reactions and may not experience the above symptoms, which is normal. Consult your doctor for details.