How do pregnancy calculators work?

How do pregnancy calculators work?

enter the first day of your last menstrual period:
Month/Day/Year (for example 05/22/2015)
here is your>>>>>  free pregnancy test calculator

 use this and Get information  when was your conception date, when your NT ultrasound should be, your anatomy scan should be and your due date will be…

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Two pregnancy test calculators and with different results?

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How to use pregnancy test?

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Will online pregnancy calculator work for me if my periods are irregular?

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