What is the correct method to calculate pregnancy duration, starting from either the date of conception or the date of the last menstrual period? How does this affect determining the delivery date?

Generally doctor counts from first date of last menstrual period.

Should I count pregnancy time from the date of conception or the date of the last menstrual period?

Artificial Intelligence Health Assistant's Answer

The duration of a pregnancy can be calculated using either the date of conception or the date of the last menstrual period (LMP). However, most healthcare providers use LMP as it is easier to track. Pregnancy is typically counted as 40 weeks from the first day of your LMP. This means that if you know your LMP, you can estimate your due date by adding 40 weeks or 280 days. Keep in mind that this method assumes a regular 28-day menstrual cycle and ovulation occurring on day

If you are unsure about your dates or have irregular periods, an ultrasound scan can provide a more accurate estimation. It measures fetal size and development to determine gestational age. Ultimately, it's best to consult with your healthcare provider for personalized guidance on calculating your due date based on either conception or LMP.

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Should I count pregnancy time from the date of conception or the date of the last menstrual period?

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