I have really high HcG with my viable babies but you are within limits. As little Dove said, it's 72 hours and really, it's about a constant rise rather than specific numbers. There can be *huge* variability in HcG counts so don't stress. I know it's so hard but wait until results from Monday. You may have had a late implant. I'm a late implanter and find the first and 2nd blood tests only a few days after implant, while higher than yours, tend to only double. By the 3rd and 4th test I'm tripling so the further along I get not only does my count obviously go up but the rate at which it increases goes way up.