Ultrasound was a week behind what I thought?

Hi team! LMP 7/25. Pos opk 8/8& 8/9, CD 14 & 15. I always had between 14 and 18 days between pos opk and period. had sex both days. Got first ultrasound 9/14 expecting to be around 7 weeks and it only showed a 6w2d baby. Left Office in tears, follow up ultrasound 9/21 to make sure it grew a week a confirm dates. Baby Heart rate was 90. Typing this out is actually making me feel more calm but wondering, is this normal to find dates diff from what you were expecting?

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