What are the reasons for embryonic arrest?

Patient's question:

I am in my first pregnancy, about 52 days along. Because there was a delay in my previous menstrual period, but the gestational sac is elliptical, increasing in size, but still no embryo and yolk sac were seen, 20mmx14mmx19mm.

Doctor's answer:

Analysis of the condition: Hello, at 52 days of pregnancy, no embryonic pole or fetal heartbeat was observed. This may be due to delayed ovulation, or it could be caused by insufficient progesterone in the body, leading to delayed fetal development. The former is normal, while the latter is not, and requires treatment to support fetal development.
Suggestions: It is recommended that you do not worry excessively. You can have a blood test to check your progesterone and HCG levels. If they are normal, a follow-up ultrasound in one week should reveal the embryonic pole and fetal heartbeat.

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