Low implantation

So I just had an early ultrasound done today at 5wks4days.

The gestational sac & yolk sac were present so this was good.

However, my RE seemed concerned with how low it was. She said that could be where it implanted, or I am miscarrying & it’s moving down.

Anyone have a similar story & have a positive outcome?

My next ultrasound is in a week, so I won’t know much until then.