The time when pregnancy reaction appears after pregnancy varies from person to person, some pregnant women have more serious nausea and vomiting at night and some have more serious vomiting in the morning. After pregnancy, most pregnant women will have nausea, vomiting and loss of appetite due to the increase of HCG level in the body. The increased secretion of stomach acid at night or on an empty stomach will stimulate the gastric mucosa and aggravate the symptoms of pregnancy vomiting. Pregnant women are advised to eat less and more meals to keep a small amount of food in the stomach to reduce the symptoms of pregnancy vomiting. If nausea and vomiting are serious, you can take vitamin B6 orally to stop vomiting.