Which is more accurate?

Question

I went to have my gender anatomy scan yesterday and the tech said the baby was measuring 19 weeks and she’s 11oz and changed my due date but my doctor said according to my last period I would be 20 weeks.

Answer

Go by what the tech said. They are measuring the baby and can actually see the baby hence the scan. Yes going by your LMP is accurate until you get your scan and it's normal for your due date to change

Answer

The LMP date is an estimate based on averages x

Answer

The baby measurement as depends when you ovulated and it’s not always the same.

Which is more accurate?

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