Is pregnancy calculated from the start of the last menstrual period?

Patient's question:

No

Doctor's answer:

The normal gestation period for humans is approximately 40 weeks. In medicine, the first day of the last menstrual period is often used as the starting point for calculating the estimated due date. So now you are 105 days pregnant. Under normal development, it is usually possible to see the fetal bud and cardiovascular fluctuations around 7 to 8 weeks of pregnancy. In normal intrauterine pregnancies, it is often possible to clearly see the intrauterine gestational sac and the fetal bud with a heartbeat at 42 days after stopping menstruation.

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