Does anyone have a chart with crown rump length measurements to weeks/days?

Laura • baby # 1 february 2020 👧 baby # 2 july 2022 ❤️

Does anyone have a chart with crown rump length measurements to weeks/days?

I’m finding conflicting charts online and wondering if anyone has an accurate one.

At my first appt it measured 12 mm - one doctor is saying 7w2d and another is saying 7w4d at that point.

Any input is helpful!