HCG levels, possible miscarriage?

By going by my LMp, whcih was May 23, I would be at 4 weeks and 4 days today. Last night, I went into the ER and my HCG levels were 760, I am not sure if that is high or low, so what do you think about that level for gestation? Anyways, I went in for a possible miscarriage, and they wanted to retest again in 4 days, and I simply cannot wait that long. Thinking about the possibility of miscarriage is driving me insane and I just want to see that number go up, because if it does, it means that I am still pregnant. So I am gonig back to ER tonight (labs are closed for the weekend right now) and I am going to request blood work. Since it is 24 hours between, I know that the number will not ahve doubled, but since it is early in pregnancy, there still should be a rise in numbers if the pregnancy is still here, correct? So if I go in tonight and the number comes back higher than 760, can I be assured that the bleeding was not from a miscarriage? And is 760 a high HCg level for 4 weeks and 4 days pregnant? Thank you ladies!