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Based on the last menstrual period, the estimated due date is 40 weeks from the first day of the period. This is just an estimate since only about 5% of babies are born on their estimated due date.

Source:
Healthline

www.firstresponse.com/en/Online-Tools/How-Far-Along-Am-I

www.babymed.com/pregnancy-calendar-and-calculator-week-by-week

www.firstresponsepregnancy.com.au/online-calculators/how-far-along-am-i/

Start with the first day of one period and count right up to the day before the first day of your next period. Count the first day of bleeding or spotting as one day.

www.thebump.com/a/how-many-weeks-pregnant

Figure out what week you are in and

www.baby2see.com/duedate.html

Your doctor or midwife uses the number of weeks since your last menstrual
period to estimate

alphapregnancycenter.net/how-far-along-am-i/

Approximately

www.pregnology.com/faralong.php

This calculator shows you

www.amazingpregnancy.com/pregnancycalendar/

... exactly how far into your pregnancy you actually are, how many days you have
left, ... You can now go on to see

www.c-point.com/JavaScript/calculators/pregnancy_calculator.php

Our Pregnancy Calculator gives you both, the fetal age and