28 weeks 3 days ago: The standard way of counting pregnancy weeks is from the beginning of the last menstrual period, and presumes a 28-day menstrual cycle. That means the pregnancy weeks officially start 2 weeks before ovulation and conception. Thus a person who is 30 weeks pregnant is presumed to have conceived 28 weeks ago. In natural pregnancies, all dates are estimates, plus or minus one week.
Answered 4/6/2017
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