When does the pregnancy cycle start to be calculated?

Patient's question:

I'm still in school, 21 years old. I recently just found out I'm pregnant. I'm a bit young, and I don't know what to do. Please ask: When does the pregnancy period start to be calculated from?

Doctor's answer:

After getting pregnant, it is necessary to estimate the time of pregnancy to correctly calculate the due date. Generally, pregnancy is calculated from the first day of the last menstrual period. For example, if the last menstrual period was on April 22nd, then the first day of pregnancy is April 22nd, and adding 280 days to it gives the due date. In fact, this calculated due date is an estimate, and the actual delivery time may vary by one or two weeks from the estimated due date. In addition to the standard calculation method, pregnancy can also be estimated by the time of fetal movement.

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