Has anyone else had this happen

Bridget
I posted this in first trimester but thought someone here may have had a similar thing happen...
​I had some spotting and cramps over the weekend and went to the ER. They did an us and found just a sac measuring 5w5d with a HCG level of 9000. Now according to lmp I would now be 7 weeks. They are sending me for another hcg and an us next week.  Went to my OB today he said everything looks great and we have to wait til next week to see.
​Anyone else think they were further, and see just a sac but then see something in their us the next week?