Due date: These can always be tricky to predict. Did you have an early ultrasound at around 6-10 weeks? That would be most helpful and likely most accurate. Generally we calculate 40 weeks from the first day of your last menstrual period (LMP)(to base a pregnancy due date on LMP date). From conception to delivery is on average 38 weeks. It does get a bit confusing. Talk with your OB if you are worried
Answered 7/18/2014
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