If a pregnant woman does not experience vomiting, it is a normal manifestation and does not need to be overly nervous. Pregnancy reactions start to appear around 40 days after pregnancy, showing nausea, vomiting, loss of appetite or drowsiness, body aches and weakness, which are inevitably related to the individual’s physical condition and hormonal secretion in the body. The absence of vomiting may be due to the late implantation of the fertilized egg, or the pregnant woman herself will not produce vomiting, so there is no need to be too nervous. Some pregnant women may experience nausea and vomiting after one and a half months of pregnancy, which will stop in about two months, but most of them will disappear in the third trimester of pregnancy.