Most pregnant women begin to experience early pregnancy reactions at 35 days of pregnancy, usually around 40 days. Early pregnancy reactions are very normal during early pregnancy and most women experience them, including loss of appetite, dizziness, fatigue, drowsiness, gastrointestinal reactions and so on. The appearance of these reactions is very obviously related to the development of the fetus and changes in hormone levels. Pregnancy vomiting reaction is also a state of self-protection, which allows pregnant women to pay more attention to their physical condition and is beneficial to the development of the fetus. Mild early pregnancy reactions do not require special treatment, and most of them can be tolerated if you eat lightly and pay attention to rest. However, a few pregnant women may have particularly severe vomiting reactions due to poor health or rapid increase in hormone levels, in which case they need to go to the hospital for examination.