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The most prevalent way of calculating the expected due date would be to use the 1st day of your last menstrual period. This could be employed only if your menstrual cycle is normal and your property test confirmed pregnancy. Normally, an average pregnancy lasts for 280 days (or 40 weeks) from the start of the last menstrual period. That’s what you can use to count ahead and calculate the due date, too as figure out how far along you are now.
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