How big should a 70-day fetus be?

Patient's question:

How big should a 70-day fetus be? First follow-up question: If the gestational sac starts to disappear, does it then become the placenta?
Will I definitely see a fetal heartbeat and fetal bud at 70 days?
What does a standard 70-day ultrasound result look like?
I'm planning to go to the hospital for an ultrasound the day after tomorrow, and I'd like to get some information in advance. Thank you!
Second follow-up question: If I can't detect a fetal heartbeat or heartbeat at 65 days, is that not normal?
How big is the placenta + fetus at 65 days?

Doctor's answer:

Hello, 70 days pregnant, which is 10 weeks pregnant. Under normal circumstances, the gestational sac is about 5.0 cm in size at this stage; the fetus is approximately 2.83 cm, and all organs of the fetus have formed, with the placenta taking initial shape. The ultrasound shows a crescent-shaped placenta, and the fetus is active in the amniotic fluid. I don’t know if your ultrasound results match the above standards?
Recommendations:
- Have regular prenatal check-ups;
- Don’t forget to take folic acid to prevent neural tube defects;
- Stay away from toxic substances and environments;
- Avoid electromagnetic radiation;
- Rest and take care of your pregnancy peacefully.

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