The time when pregnancy vomiting starts in early pregnancy varies greatly according to the physical condition of each pregnant woman. Most pregnant women will have pregnancy reactions such as nausea, vomiting, loss of appetite and oil aversion after 40 days of pregnancy. After pregnancy, HCG in the body starts to rise, and the level of HCG reaches a high value around 6 weeks of pregnancy, which leads to nausea and vomiting of pregnancy reaction, mostly manifested as morning sickness, while some pregnant women are not sensitive and have a mild pregnancy reaction. If the pregnancy reaction is more serious leading to water-electrolyte imbalance, timely rehydration treatment is needed to avoid the impact on the development of the fetus, which will also affect the physical health of pregnant women.