but *I* contradict all of that since I know for a fact that I ovulate early in my cycle, and my last 2 pregnancies were longer than average. i calculated EDD by LMP & by conception date, and there were a few days difference, but not significant. DD2 was conceived on day 5, and DD3 was conceived on day 6 after LMP.
I had a late u/s with DD3, which pushed the EDD back one week - so, even if that was true, she was 42 weeks gestation. An u/s 2 days before DD2 claimed she had 3 more weeks to cook!!! (I cried - thankfully, they were wrong)
So, while I am sure there is a correlation somewhere, I'm just not convinced it's that cut & dry.