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A member asked:
Lmp unknown irregular cycles! u/s 29th jan 11w1d crl 44mm & 4th feb 12w1d crl 56.3mm. edd 18th august ..when is the latiest likley conception please?
A doctor has provided 1 answer
Estimate only: "working backwards" is too inexact to pinpoint specific day, but a simple calculation suggest conception between november 25-november 30 2012. If ultrasound dates were absolutely reliable (they're not, they are usually +/- 3 days) then conception likely closest to november 26. Recall too, sperm may live 48-72 hours, so date of conception could be several days after last sex!
Answered 7/10/2013
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