What is the reason for seeing a fetal bud but no primitive heart tube in prenatal examination?

Patient's question:

Pregnancy test 1.3#0.4 now checked 4.9#2.8 gestational sac echo, visible fetal pole, no primitive cardiac observed, bilateral adnexa. What's going on?

Doctor's answer:

Hello, it is abnormal for the fetus not to show fetal bud and primitive cardiac tube at two months of pregnancy, and there is a high possibility of embryonic arrest. Generally, the fetal bud and primitive cardiac tube can be seen around 45 days of pregnancy, and the latest should not exceed two months.
Generally, doctors will advise women with risk signs of prenatal examination to rest in bed and prohibit sexual activity. Additionally, patients should also create an environment conducive to emotional stability and stress relief. Wishing the patient a healthy delivery.

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