For most pregnant women in their second trimester, there is no obvious feeling, but some pregnant women may experience some early pregnancy reactions, such as nausea, vomiting and other digestive symptoms, as well as dizziness and drowsiness, sleepiness, fatigue, etc. Some pregnant women may also experience a surge in appetite, strong hunger and changes in eating habits. Some pregnant women do not have any clinical symptoms throughout the pregnancy, while others may experience nausea, vomiting, or even severe pregnancy reactions, and need to go to the hospital in time for treatment.