What reasons can cause a B examination not to detect fetal heartbeat palpation

Patient's question:

Medical history and treatment outcomes:
Three weeks ago, I started experiencing some pregnancy symptoms. Two weeks ago, a urine test confirmed pregnancy. One week ago, the ultrasound results showed that the gestational sac was approximately 9 weeks, but the fetal heartbeat could not be detected. Two days later, I had another ultrasound at a different hospital, which showed the gestational sac as approximately 6 weeks, still without a regular fetal heartbeat. The doctor advised me to come back in a week for another ultrasound to confirm.
I am currently worried about whether the fetus can still be saved. Could multiple ultrasounds have a negative impact on the fetus? What should I do next?
Three weeks ago, my appetite

Doctor's answer:

If there is no fetal heartbeat at 7 weeks of pregnancy, it may be a problem. This situation is considered problematic and requires further examination to clarify the following: on one hand, an ultrasound examination should be conducted, and on the other hand, hormone levels should be checked. Of course, some cases involve later ovulation or delayed fertilization, which can result in the embryo being smaller than usual, but subsequent development is normal. Therefore, in your current situation, it is best to wait and see for a week. If development is good, it can be kept. If there is still no heartbeat after a week, it may be necessary to let it go.

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