Ps. I know it is more accurate to calculate by LMP but that means I would have conceived only days before my next period. And also, I'm speaking hypothetically. It just wouldn't add up.
Conception only happens at the time of ovulation. Sperm can live up to 5 days inside a woman, so if you calculate your due date by the date you had intercourse you could be off by as much as 5 days.
So, if you had sex on Nov 6 you could have conceived any time between then and Nov 11. It just depends on when you ovulated.