Here's something to think about...
I just found this and thought it was pretty neat. It's based on a 10 day standard deviation of your due date.
https://spacefem.com/pregnant/due.php?use=EDD&m=12&d=2&y=11
edit; Check out the "Motherhood" tab on this page...it has other cool stuff..statistic wise...
Re: Pregnancy Due Date Ranges
41 w & 1 day would put me right on Christmas.. which I was hoping to avoid but I have a really strong feeling this will be LOs bday since last year I asked Santa for a baby at the mailbox thing they had at Macys. DH thinks thats a crazy reason but he's been saying Christmas all along