Confused with dates

No`5 🐝 happy • Religion - Jedi. Cares about - my children. Things I find funny - actual religion. Dislikes - fancy foods.
So I had a scan yesterday, I should of been 6 weeks and 6 days from my LMP, but baby measured 7 weeks 2 days.  Was told my due date was not what I thought it was 18th October and that it's more than likely a few days earlier.  They never gave me a actually date so what date would you say I was due