Pregnant women are not nauseous for 10 days of pregnancy and usually do not experience early pregnancy reactions such as nausea and vomiting until about 5-6 weeks after pregnancy. The timing of nausea and vomiting varies slightly due to the existence of individual differences. At 10 days of pregnancy, the embryo enters the uterine cavity for a short period of time, and the level of human chorionic gonadotropin secretion by trophoblast cells is low, which has less impact on the body, therefore, pregnant women do not feel nauseous. In the 5th to 6th week of pregnancy, pregnant women may experience morning sickness, vomiting and other gastrointestinal discomfort, which are normal early pregnancy reactions. Some pregnant women may be more sensitive and experience vomiting in the first month of pregnancy, while some may experience vomiting later or even not at all. Usually, pregnancy vomiting disappears on its own in about three months of pregnancy. After pregnancy, women should relax and keep their mood relaxed, avoid greasy, cold, spicy and stimulating foods, and eat more fresh vegetables and fruits to promote the growth and development of the fetus.