The occurrence of nausea, vomiting, dizziness and drowsiness after pregnancy is highly related to the elevated HCG level in the body after pregnancy, as the sensitivity to HCG varies from individual to individual. Even if the level of HCG value in the body is exactly the same, the manifestation form and severity of early pregnancy reaction varies a lot. Simply based on the conscious symptoms of nausea and vomiting, it does not indicate that the HCG value in the body is increasing, and the HCG value can reflect the good or bad quality of the embryo in early pregnancy. In order to accurately assess whether there is an abnormality in early pregnancy, it is important to go to the hospital in a timely manner and have a blood HCG test to observe the increase and the doubling of the value every other day and analyze it in relation to the specific number of days of pregnancy.