One doctor replied back that i'd be further along than a few days if my hcg level was at 634. could this be past a week?

Yes: The HCG levels usually double every two days. So if your HCG is 634, then 2 days ago it was probably around 300, 2 days before that 150, 2 days before that 75 and so on. This is not an exact science but doctors can use this information to see if a pregnancy is progressing normally. There is no way to say exactly how many days along and the HCG may not be measurable in very early pregnancy.