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A member asked:
When books or websites say 4wks, 9wks ect. pregnant do they mean from ovulation or from last period? i know drs mean from last period.
3 doctors weighed in across 3 answers
Fertilization point: Text books and references usually count time from fertilization. Most people won't even think about a pregnancy until one period is missed though.
Answered 10/21/2016
4.5k views
No way to know: As you say, the convention of doctors is to measure pregnancy from the start of the last periods- I have never understood this as it means you are 2 weeks pregnant at the moment of conception. But since there are thousands of books ; websites it is impossible to know if they all abide by the same convention. But if they are discussing time from conception i would hope they would say so.
Answered 10/21/2016
4.5k views
Last period: Books, doctors, websites all use the same system. The dating is from your last menstrual period. F that is unknown, the estimated date of conception is week 2
Answered 10/21/2016
4.5k views
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