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

Will online pregnancy calculator work for me if my periods are irregular?
No, it won’t be totally accurate…they never are! Both pregnancy AND ovulation calculators tend to work on the assumption that you have a 28 day cycle and ovulate on CD14. If either of these are wrong, your due date (for either) would be thrown off.

Pregnancy is said to begin on the day of menstruation, but in reality, it’s 2 weeks prior to ovulation, whenever that is for the woman in question. If you are PG and just want a due date, the date you get from an online calculator will be the same that your doctor or midwife will give you…however, that could change by several days or even a couple of weeks if you have a dating scan before 12 weeks, as this will be more accurate than guessing.
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