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Then the doctor will give the patient her estimated due date (EDD), not the estimated date of her last period.
In other words, the doctor doesn't Confirming the correct dates of your pregnancy.
Because this practice assumes a regular menstrual cycle of 28 days, with ovulation occurring on the 14th day after the beginning of the menstrual cycle, this practice does not account for inaccurate recall of the LMP, irregularities in cycle length, or variability in the timing of ovulation.
Since in the current answers there is no information about normal pregnancy duration I've decided to add my own answer for the sake of clarity.
In Spain, when they say "your pregancy is of 6 weeks", they mean 6 weeks since last menses :) The exact time of conception can not be know. I always assumed that they used that date because it was something people (usually) knew - they don't know ovulation unless they're using tests, but even a hundred years ago people could most often tell the date of their last menses.
Two weeks is a good estimation, but it is not know for sure. But for someone with PCOS, I'd be curious if the date of last menses is actually relevant, or if they figure out a better [email protected] - they use that day only because the average menstrual cycle is 28 days, and ovulation usually occurs 14 days before the next menstrual period.
Back to question, it is clear that the couple should calculate the conception date adding (around) 14 days to the calculated last menses.Because of the mentioned unpredictability, it is accepted to calculate the dates related to a pregnancy based on the date of the last menstruation.This is why most people think that normal pregnancy lasts 40 weeks.When ob-gyn performs US and says "Your pregnancy is of 6 weeks" what does it mean: (1) six weeks since last menses or from actual conception date?The question is related to some interesting story: the husband was abroad at the time of the calculated "last menses" (woman has POS with menses 2 times per year), so if he did not know the answer to this question he could think that he is not an actual father of the baby.