Baby measuring big

So I’m currently at the end of my 36th week and my doctor was doing an ultra sound this morning. He said the baby was measuring big and calculated that he is about 6 pounds 6 ounces. But then I noticed that the screen on the ultra sound said 38 weeks.

I didn’t ask anything cause I actually got distracted after I saw that, and my doctor didn’t say anything about the 38 weeks. But I’m so confused. I feel like if I was measuring 38 weeks the baby would be bigger than 6 pounds 6 ounces?

Thoughts?