Is it possible?

I thought I was one week further on when I found out I was pregnant before my dating scan.

When I had the scan they put me as one week behind what I thought but didn’t seem concerned.

Fast forward I’m now 32 weeks but at all my growth scans I am measuring 1-2 weeks ahead of what I’m supposed to be.

Is it possible I have always been the date I thought I was due and my first scan was wrong?