Due Date Question

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So the day of my last period was dec 28th. My next period should have started Jan 24th. I took an at home test Jan 29th and got a really strong positive line immediately. That puts me at an estimated 9w5d today. My first ultrasound is march 29th. My question is, how far along were you based off of the baby measurement as compared to your original estimation from your last period? I'm so ready to know!