Dr requested to move my 2nd U/S up...

So I posted previously about how according to my LMP, I should be about 6/7 weeks but how at my 1st ultrasound last Friday (11/3), they could only see a yolk sac. They scheduled me for a 2nd sonogram on 11/21 as they wanted to see me about 2 weeks later.

I received some positive feedback that has helped my keep pretty calm etc.

Well my Drs office just called and my Dr is requesting I come in a week earlier so I now go on 11/14. Why? I'm confused and wonder if something could be wrong?

I go tomorrow for my 1st OB appt so I'm going to ask then but I'm hoping someone can maybe give me some insight.