Drum Roll Please

I went yesterday for my follow up BETA. They were looking for it to have at least doubled(it was 84 before). They called and said it is over 600. Crazy! We have an U/S booked for the 28th. It looks like 600 can be in the normal HCG range for one baby or two. I am hoping for just one. The couple will be happy either way but I think they prefer one at this point too. They live in NYC and I can't imagine trying to get around with twins is super easy.