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how accurate are conception calculators?
are conception calculators accurate if you had sex with two different partners six days apart?
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134578 tn?1463413330
Six days is asking a lot.  However, if you have an early ultrasound (say in week 7, 8 or 9) you could possibly count on what the calculator says based on the due date given to you by the person who measured the embryo.  In other words, the calculator is not the issue, the accuracy of the original estimate of due date is the issue.  You cannot figure out a 6-day difference based on just counting from the first day of your last period.  You need a really super-accurate measurement of the embryo.
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