The pregnancy reaction will disappear immediately after the fetus stops developing and there will be no nausea or vomiting. It should appear in the first 3 months of pregnancy, there will be no other uncomfortable manifestations, if after 3 months of pregnancy, there is no pregnancy reaction in the course of the cessation of fetal development will not appear any discomfort, will not immediately feel the cessation of fetal development, most of the time in the time to do a checkup to find that the fetus has stopped the heart tube pulsation. During the first 3 months of pregnancy, if nausea or vomiting disappears, an ultrasound should be done in time to check the development of the fetus. If it is found that the development of the fetus has stopped, abortion should be carried out as soon as possible to avoid the fetus staying in the uterine cavity for too long, which may easily cause intrauterine infection.