When does the yolk sac disappear in early pregnancy?

Patient's question:

No

Doctor's answer:

Hello, under normal circumstances, there should be a yolk sac at 6 weeks of pregnancy and a gestational sac at 7 weeks. Your ultrasound shows that the size of the gestational sac is around 6 weeks of pregnancy, and there is no yolk sac detected for the time being. This may be related to the late implantation of the fertilized egg. You can have blood tests for progesterone and blood HCG. It is recommended to actively undergo treatment to preserve the pregnancy first, and you can re-examine the development of the yolk sac and embryo in 10 days.