What are the reasons for not having a fetal heartbeat during pregnancy

Patient's question:

No

Doctor's answer:

There is a high possibility of embryonic arrest. Embryonic arrest refers to the cessation of development of the embryo in the early stages of pregnancy due to some reason. Ultrasound examination shows that the embryonic sac contains disorganized fetal buds or fetuses without fetal heartbeat, or it appears that the embryonic sac is withered.