If the pregnancy has been confirmed, but the pregnant woman does not have symptoms of vomiting, most of the cases indicate that the pregnant woman’s reaction to pregnancy is mild, which is a normal phenomenon. Whether or not a pregnant woman experiences vomiting during pregnancy is related to her own physical condition, and not all pregnant women experience vomiting. Pregnancy vomiting belongs to the more common early pregnancy reaction, mainly related to the body of the human chorionic gonadotropin increase. Under the influence of hormones, pregnant women’s digestive function is weakened, and they are unusually sensitive to various odors, manifesting themselves as loss of appetite, dizziness and fatigue, aversion to greasy or acidic food, morning sickness, nausea, etc., collectively referred to as the reaction to pregnancy, and the symptoms generally begin to appear in the 6th week after menopause, and improve after the 12th week of pregnancy. Most pregnant women can have early pregnancy reaction, but due to individual differences, a few pregnant women may not experience pregnancy vomiting until delivery, as long as the blood test and ultrasound examination is normal, do not worry too much, it is normal. However, it is necessary to exclude some abnormalities, such as fetal arrest, after the embryo stops developing, the HCG level decreases, resulting in pregnant women do not experience pregnancy vomiting. At this time, you need to go to the hospital, through blood tests and ultrasound and other tests, to clarify the hormone levels in the body and the development of the embryo in the uterus.