Sounds from your November 29 due date like you got pregnant around March 8. I think (but check this with your doctor) that the AUA, like the GA, is calibrated to begin on the first day of your last period.
My lms was Feb 18th, I conceived March 3rd. And I'm due November 24th if that helps. You conceived two weeks after your lmp. But a males *** can last up two seven days in there, while your egg only last 1 day.