When the heck is my due date?😂

So I just moved from TN to PA. In TN my doctor said my due date lined up with my LMP & it was July 14, 2022. My TN doctor faxed all my records to the midwives I’m seeing here in PA & they’re saying I’m due July 20 because my 9 week ultrasound I had in TN showed baby was measuring 6 days behind. My doctor in TN said she doesn’t change the due date unless baby measures more than a week ahead or behind.

I have my anatomy (20 week) scan scheduled for March 7 so we’ll see how baby is measuring then & I’m sure they’ll correct it if needed. I know they’re just guesses anyway but I’m just confused…😅