Baby size and due date accuracy?

Hey all! I found out I was pregnant very early in my cycle September 14th, my last period was Aug 16th, when I went to first check up the fetus at the time was smaller than initially expected for 5.5weeks

On later check baby looked on track for just having conceived on a 5 day delay

So he moved my EDD from May 23-28th

Now I’m about 26.5 or 27.5 weeks, and she’s measuring a few weeks ahead (ie was length above and weight wise 1lb 12oz @ 24weeks)

She feels huge and developed in there lol is she maybe just ACTUALLY 5 days older than initially estimated?