Early growth rate normal?

So I had a confirmation ultrasound at 6w0d where I measured 5w6d so only one day behind. Then I had another ultrasound yesterday at 7w6d where I measured 7w2d. We saw and heard a heartbeat which was 146 so the baby is looking health but I’m confused and a little concerned how I went from measuring 1 day behind to 4 days behind. Is this normal?

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