How to calculate gestational age

Patient's question:

I consulted some people. My period came on November 25th, and it's been about how many weeks pregnant now. Your answer here is about two weeks pregnant, but others told me it's four weeks pregnant. I'm confused, please explain! If it's four weeks, would there be symptoms like nausea?

Doctor's answer:

Due date is the year of the last menstrual period plus 1, the month minus 3, and the day plus 7.

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