It is usually not dangerous for a pregnant woman to be suddenly startled. When a pregnant woman is startled, it will lead to sympathetic nerve excitation in the pregnant woman’s body, resulting in symptoms such as rapid heartbeat, shortness of breath, sweating, flushing, etc., and a sudden feeling of fear, which will disappear in a short time and be able to return to normal on its own. There is basically no effect on the fetus, the fetus is in the amniotic cavity, the surrounding amniotic fluid has a protective effect on the fetus. When a pregnant woman is frightened, she needs to observe whether there is any discomfort or obvious symptoms. Perform ultrasound, blood tests for progesterone and HCG, etc. Try not to go to crowded places in the late stage of pregnancy, which is easy to collide with the abdomen, and if it touches the site where the placenta is planted, it is easy to lead to early detachment of the placenta. Pregnant women need to reasonably regulate their mind after being frightened, if the mental tension is prolonged during pregnancy, it may cause uterine contraction leading to miscarriage, premature labor, and so on. During pregnancy, you should relax, maintain a healthy lifestyle and ensure a good work schedule.