Vomiting usually occurs at about six weeks of pregnancy. The time of pregnancy is counted from the first day of the last menstrual period. Women of childbearing age who usually have regular menstrual cycles can determine if they are pregnant by using a urine early pregnancy test if their periods are delayed for a week. The symptoms of digestive system are more common, such as nausea, vomiting, aversion to oil and grease, change of appetite, etc. There are also some other symptoms such as drowsiness, weakness, breast swelling and frequent urination. However, each person’s specific symptoms are different and their severity varies, and they will generally disappear around 12 weeks of pregnancy. If the early pregnancy reaction is not serious, it is usually not necessary to deal with it and just go with the flow. During the third trimester of early pregnancy, the main attention should be paid to avoiding sexual intercourse and strenuous exercise, which may lead to miscarriage.