The reaction to pregnancy usually occurs around the 6th week of pregnancy, depending on the individual’s body type, and there are significant differences. Early pregnancy reaction is mainly caused by the increase of hCG, the human chorionic gonadotropin, which will gradually increase after pregnancy, usually reaching a peak between 8 and 10 weeks of pregnancy and decreasing significantly after 12 weeks of pregnancy. Therefore, early pregnancy reaction is usually the most severe around 8-10 weeks of pregnancy, and most of them can be relieved by themselves after 12 weeks of pregnancy. Early pregnancy reaction has obvious individual differences, because each person has different sensitivity to the increase of blood hCG, and the mildness or absence of early pregnancy reaction is usually normal, so the growth and development of the fetus cannot be judged simply by early pregnancy reaction. If early pregnancy reaction occurs during pregnancy, it can be improved by adjusting the diet, and it is recommended to eat light and oily food, and to eat less and more meals. If the vomiting is serious, you can take vitamin B6 orally to relieve it, but you should consult a professional obstetrician for details.