HCG Not Quite Doubling?

I’m 5 weeks + 4 or 5 days. I had my HCG drawn on Monday and the result was 2877. I had it done again today (Wednesday) and the result was 4864. My doctor hasn’t commented on the results yet. It’s a doubling time of 2.64 days. I’ve had two prior pregnancies - one successful and HCG more than doubled in 2 days and one unsuccessful and HCG dropped. This I guess is somewhere in the middle? I know I’ve read that HCG doesn’t always double, but I can’t find anything conclusive about what the limits of that are. Has anyone had a doubling rate of something like 2.64? If so, how’d things go? Thanks!