HCG rising but not doubling

Hi everyone. Desperately looking for advice.

I had my blood drawn at 6+1 and my HCG was 16,737. I had it drawn two days later and it was 20,146. So it rose but did not double. And it only rose by 20%. (Note: I know this pregnancy isn’t ectopic.)

Has anyone ever had similar numbers and gone on to have a healthy pregnancy?

Thank you for the help. ♥️