From the first day of the Last Menstrual Period (LMP)
280 days
40 weeks
10 lunar months9 calendar months
From the day of fertilization
266 days
38 weeks
(Adding 14 days gives a total of 280 days from the LMP)
Duration of Pregnancy
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280 days
40 weeks
10 lunar months9 calendar months
266 days
38 weeks
(Adding 14 days gives a total of 280 days from the LMP)