Generally speaking, 5-6 weeks of pregnancy is almost likely to produce the reaction of pregnancy vomiting, but there are a small number of pregnant women who do not experience pregnancy vomiting. Generally speaking, at 5-6 weeks of pregnancy, that is, around 35-40 days of pregnancy, as the embryo has already been laid and the hormone level of the pregnant woman is gradually changing, then nausea and vomiting and other manifestations will occur. However, the duration of nausea and vomiting varies depending on the physical condition of each individual, and a small percentage of women do not experience nausea and vomiting. If nausea and vomiting occurs, pregnant women can eat small meals and light meals. Under normal circumstances, the early pregnancy reaction will disappear by the 12th week of pregnancy, so there is no need to be too anxious. However, if nausea and vomiting are severe, it is advisable to consult a doctor and choose the appropriate treatment to avoid electrolyte imbalance.