Is there a small chance of yolk sac fetal arrest?

If the female menstrual cycle is regular and the yolk sac is normal, it can be detected by B ultrasound at about 40 days after menstruation stops, and then the fetal bud and fetal cardiac tube pulse can be detected at 50-60 days after menstruation stops, which indicates that the pregnancy is normal. However, clinically, there are also cases of embryonic arrest after the discovery of yolk sac, no embryo bud fetal heart, belonging to empty gestational sac, mainly related to poor quality of embryo itself or poor uterine environment, insufficient endogenous hormones of mother and other factors. Therefore, after the discovery of yolk sac, pregnant women should also do regular prenatal examination according to the doctor's regulations.