Do you go by size of baby or last period for due date?

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My doctor said they only change the due date if baby measures more than a week different than LMP. Maybe some practices are different, but that seems common.

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Size of baby from my ultrasound at 7w1d (it also happens to be the same as my LMP). With my first I also followed the ultrasound, my LMP put his due date as the 10 and the ultrasound was the 16th. So not a huge difference.

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I went by my lmp until I had my scan and it put me at 11 weeks, 1 day so that changed my due date from the 11th to the 17th and then I went back five days later for another scan as baby didn’t want to move much in the first scan for measurements etc and then I was 12 weeks exactly and my due date is now the 16th so it wasn’t out by much.

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Size of baby with my other two daughters they were 3weeks Off my lmp I had irregular periods then this one is right on my lmp

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i cant go by lmp i had a miscarriage in jan and literally got pregnant right after i havent had a period since nov technically unless you count the miscarriage

Do you go by size of baby or last period for due date?

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