Measuring bigger then I should be

Sam

So on Wednesday I was 26wks 3days so I’ll be 27wks tomorrow but Wednesday at my doctors appointment I had my stomach measured for the first time and doctor said I was measuring at 29wks 🤷‍♀️ he just told me it’s nothing to worry about and I don’t feel it’s that big of a deal but now I can’t help to question does that mean I have a big baby or am I actually further along? My original due day was January 2nd and it was changed to January 13th when I switched my prenatal care office and they took into consideration I had an irregular cycle which varied from 27days to 45days. Idk just something I’m curious if anyone else has experience with measuring further along and baby be born around original due date or ended up having complications or just having a big baby. And another reason I’m curious because I’ve had all 3 of my last children at exactly 38wks so just want an idea of how this measuring further along thing works. I obviously plan on asking my doctor more questions as I get further along and if she continues to grow further along then I should be. Thanks in advance 😊