And my second beta was....

907! My doubling time was 1.45 days!

Here is how my beta compares on betabase.info:
Single Pregnancies:
DPO.......Median HCG.......Lowest HCG.......Highest HCG
17............293.......................5............................4591
18............402......................7............................6234

Twin Pregnancies:
DPO.......Median HCG.......Lowest HCG.......Highest HCG
17............582.......................54..........................3684
18............801......................67..........................5079

Triplet+ Pregnancies:
DPO.......Median HCG.......Lowest HCG.......Highest HCG
17............884.......................21..........................3193
18............1207.....................22..........................8060

So what does this mean?
I'm still pregnant! That's what is most important. Secondly, my beta is still in the high average range for a singleton and is still competing in the ranges with the twins and triplets. But I'm still pregnant!