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I would go off LMP or better yet ovulation if you were tracking. Babies can measure ahead and behind at various times in the pregnancy from what I understand. My doctor wouldn't move my expected due date unless it was more than 2 weeks "because babies come when they want to".

@Mama Bird: it’s really frustrating and hard to be overdue. But usually there’s a maximum they’ll let you go if you’re with a doctor/midwife so I always reminded myself of that everyday I didn’t go into labour.

Oh, and I forgot that I had a scan at what I thought was 6+1 with my second pregnancy, but it ended up being 6+5 and so they adjusted my due date by those 4 days and my water broke two days before my due date so I guess the adjustment was accurate for me. And at subsequent ultrasounds the baby always measured at the new date not my lmp date.

And if your anatomy measurements matched up with the changed date then I’d assume the early date was correct. You’ll also know based on how big your baby is if it was truly overdue too, I feel. My first baby was definitely overdue at nearly 10 pounds and my second was born at 39+6 at 8.13 so that’s how I gauged that my first one was truly overdue. Haha. Although that’s obviously me just mostly making up stuff for that being an accurate gauge.

With my first, my periods were all over the place with really long time between ovulation. Based on period dates, my estimated due date was Sept 16. Then after first semester scans, Sept 23. But she was born Oct 1. So there’s that

@Mama Bird: you must be so frustrated right now!! I would bet your original due date was your "proper" due date. I hope you get a Thanksgiving baby.

@Mama Bird: My midwives tended to call it a guess date and wouldn't induce until you were 42+1 if the pregnancy was healthy. However, I have two experiences: with DD1, LMP put my due date at 10/12 but my early scan indicated a 10/4 due date. I ended up delivering at 40+4. With DD2, my LMP put my due date at 9/30, but a scan at 7 weeks put my date back to 10/5. I ended up delivering at 41+5 and she was smaller than her sister (who was already on the small side of average). So as long as everything is good with you and baby, I wouldn't worry about being "overdue", because it's all a guess anyway.

With both of my kids, my due date was based on an early scan - 7 weeks - which lined up exactly with ovulation and not LMP (I ovulate on CD21). I delivered at 41+1 and 40+5, respectively.

I'm 1 of 4 kids and we were all super late so I assumed I would go late and did.

LO was 7 days overdue. More time for everything to grow!