Changing my due date?

Haley.Beth

So at my first u/s at 9 weeks, the u/s tech put my edd at Jan 18. But since my lmp was Jan 11, my OB just stuck with the 11th. But at my a/s, the tech said 1/20 again. I didn't get to talk to my OB after this appointment, but I'm thinking my real due date is going to be the 18/20th. This is actually a big deal, since my OB induces automatically at 41 weeks. So that one week could make a big difference in the long run. Should I change my date?