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The closest thought I have would be to go back 40weeks, then forward 2 weeks. This thought is based apon the fact of your aprox due date and taking it back to to what would have been the first day of your last period and then the 2 weeks forward would be roughly your ovulation time frame. I think that would be the best estimate you could ask for. btu who really cares!! for an advanced algorithm take a look at www.redbabybook.com

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Q: How do you figure out the approx date of conception based on your due date your due date is sept 18th your pregnancy is not consistent with your lmp your ultrasound was consistent with your due date?
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