Measuring 5 days behind

Chezzure • 👪 pregnant with baby #2
Hello, I'm currently 9 weeks 6days. I'm only measuring 9 weeks 1 day. My first appointment was 2 weeks ago and I was measuring correctly. My OB said it's no reason to be concerned and it's hard to measure so early on.  I just don't want to feel like I'm alone. My baby heart rate was 170 and baby was moving a lot!! That made me smile😌 but I can't help but think the worst. Anyone else has similar stories?