Size of baby and change of due date.

Molly

So my lmp was May 3rd,2022, I know this because I had gotten it on my way home on the greyhound. Well anyways. Fast-forward to June 3rd my test was blazing positive before the control line could finish. Well anyways my levels were 388 which they said it fits in the 4 week range mark. So your on track. Well after today's appointment, she now weighs 3 pounds 5 oz and due date changed from Feb. 7th to Feb 1st because of her weight and the size of her head. And now I'm only supposed to be at 29 week 1 day mark. I am now 29 week 6 days. So off by 5 days. Is this normal for her to advance in size by 5 days I know everyone says it's normal but my mom keeps asking me are you sure you have your dates right. I kept saying yes. So I have no idea. 🤷 Someone help me out? Because based of off my last period (May 3rd, 2022,) I should only be 29 weeks 1 day.