Baby measuring bigger?

Fina • Mommy of 2, one boy one girl
So I had my anatomy scan on Tuesday at 20 weeks 4 days. I asked if my due date is still the same which it is but the technician told me that baby boy is measuring at 21 weeks 4 days. I'm curious if any of you ladies have had a similar situation? I'm a little scared that this may mean I'm gonna have a huge baby 😳😳😳