Beta Levels

Hi everyone! I've read a lot on beta hcg levels and the worries about the doubling times increasing quickly enough but I was just wondering about my doubling times decreasing? My doubling time seems to have gone from 46 to 37 hours. My numbers are below. 
16dpo 299
19dpo 879
23dpo 5279
If you all had any similar experiences, please let me know, thanks!
-Alyssa