Not all pregnant women will have nausea symptoms in early pregnancy, early pregnancy early pregnancy reaction: the first, and hormone levels; the second, and the pregnant woman’s physical condition, rest are related. There are some pregnant women who are in better physical condition, it is possible that they do not have early pregnancy reaction in early pregnancy. Early pregnancy without nausea response is not related, mainly depends on the development of the fetus, if the ultrasound suggests that the embryo development in line with the number of days of menopause, the embryo vitality is relatively good, the progesterone and HCG can be doubled normally, generally do not need to be too nervous, only need to carry out regular obstetric examination can be. There are also a small number of patients who have no early pregnancy reaction, which may be due to embryonic arrest.