20 weeks Length?

Anyone else confused about the size of the baby at 20 weeks? I know the app only estimates the size that your baby "should" be. However at 19 weeks it says your baby is 6 inches. At 20 weeks it jumps up to 10 inches!
That's a huge change over a week. I started looking at other sources and I saw some reports say 6.5 inches, and 1-2 others say 10 inches. That's quite a difference! Anyone have their 20 week appointment yet, did they say what size your baby is?

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