Measuring 3 days behind!?

So I just came back from my second ultrasound, last one I measured 7+5 so this one should of been 8+6 but instead I was told 8+3. I went to a different clinic for each one if that makes a difference, I did notice the second machine was very poor quality.

I’m just so nervous, has anyone else experienced this???

We saw a strong heart beat and it was moving around.