Also, how accurate is the due date?
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IIRC they actually count from the first day of your last menstrual period, not the last. Reasoning for that is that people bleed for different lengths of the time.
And the main reason that we don’t count from date of conception is that most people don’t know when that was. While we all go through the same phases of our cycle, how long each phase lasts is individual, and not everyone logs when they have sex. That makes is very difficult to calculate exact date of conception, so they use the most definite last date they have to go by.
You’ll be given a due date based on LMP when you first present to the doctor’s office, but that date is adjusted (in Canada at least) sometimes when the anatomy scan is done around 20 weeks based on the measurements they do which can more accurate predict how old the fetus is, but it usually doesn’t get altered by much. However a lot of factors can determine if baby will be born on their due date. I read a statistic some years ago that only about 5% of babies are actually born on their due date.
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