How is the number of days calculated when pregnant?

Patient's question:

I am 27 years old this year. In the past few days, there has been brown discharge from my lower body. I don't know what's going on, and I suspect I might be pregnant. Please ask: How is the number of days of pregnancy calculated?

Doctor's answer:

The estimated time of pregnancy is calculated from the first day of your last menstrual period. Based on the situation you described, everything is fine. Some fetuses grow and develop slowly, while others grow and develop quickly. As long as the growth and development are normal in the later stages, there won't be any problems.
From a timeline perspective, today is exactly 50 days into your pregnancy. It's normal not to see fetal heartbeat movements yet. You can do another ultrasound check in a few days to follow up. Everything should be fine. At the same time, make sure to rest well and enhance your nutrition.

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