Usually, the reaction of pregnancy vomiting appears after 6 weeks, the most serious reaction of pregnancy vomiting is from 8 to 10 weeks of pregnancy, and it can be gradually reduced or disappeared around 12 weeks of pregnancy. With the increase of hormones in the body after pregnancy, the digestive system is affected by the level of progesterone, resulting in gastrointestinal dysfunction of the digestive system and weakening of gastrointestinal peristalsis, resulting in symptoms such as bloating, constipation, nausea and vomiting in pregnant women. Usually, pregnant women can have early pregnancy reactions such as loss of appetite, nausea and vomiting at about 6 weeks after menopause. At 8-10 weeks of menopause, the blood HCG in the body reaches the highest peak during the whole pregnancy, so the reaction of pregnancy vomiting is the most serious. After 10 weeks of menopause, the blood HCG drops rapidly and remains at a low level, and nausea, vomiting and other early pregnancy reactions can gradually diminish. For most of the early pregnancy reactions, they can gradually disappear in the 12th week of pregnancy. If the symptoms of vomiting are mild, they can be relieved by changing the diet and taking vitamin B6 as appropriate, without special intervention. If vomiting continues to be severe, it is recommended to go to the hospital for treatment in time.