Yup, I had two tests done, because after one m/c and very little symptoms this time, I was kind of a nervous wreck!

Unfortunately, my cycle was still whacked from the m/c so I don't really know how many dpo I was when I took the tests, but the results were:
Day 1 (maybe 15 dpo?): 168.5 hcg/49.41 prog.
Day 2 (maybe 17 dpo?): 386.9 hcg/38.71 prog.
The doctor's office was happy with the increase and said not to worry and that no more tests were needed, so I'm just trying to be positive and patient until the first u/s at the end of the month.
I think anything you can do (within reason) to help your pregnancy be happy and stress-free is a good thing, for you and your little one.