What is the reason that a fertilized egg at 23 days cannot be seen on ultrasound?

Patient's question:

No

Doctor's answer:

Performing an ultrasound too early is not easy to see the shadow of the gestational sac, it's too small. The ideal time is around 8-10 weeks of pregnancy when it becomes easier to see. Moreover, performing an ultrasound too early theoretically could shake the fragile, newly formed embryo, which is not conducive to embryonic development. It is best to avoid performing an ultrasound too early.