Has anyone's bump measured roughly 3 weeks ahead?

Crystal

I'm 28 weeks and 5 days. I had an appointment today and she measured my stomach, so no ultrasound. She said I was measuring 31. She didn't seem concerned, neither am I. My question is more or less does that alter my DD? I should've asked, I know, but I didn't. The doctor also said the baby could've just been stretching while she was measuring. Has anyone measured that far ahead?