If you experience nausea and vomiting during pregnancy, it is understood that the fetus is currently developing well. This is because nausea and vomiting are caused by increased hormone levels in the body, which causes the corresponding clinical symptoms. However, in case of severe nausea and vomiting after pregnancy, it is also clinically important to exclude the possibility of hyperemesis gravidarum, which can be understood by ultrasound examination. If the nausea and vomiting suddenly stop in early pregnancy, it may be caused by the embryo stopping its development. If the pregnancy is intrauterine and the nausea and vomiting are more severe, rehydration therapy should be given promptly. At the same time, electrolyte disorders should be corrected clinically in order to facilitate the normal growth and development of the embryo.