Confused about my due date

Ana

So according to my last period 2/1 my due date is 11/8

But I got a positive ovulation test on 2/19 and I’m guessing that’s when I conceived which gives me a due date of 11/12

The doctors gave me a due date of 11/13. Which one would you guys go off of? I know it’s only a 4 day difference but I’m just confused lol