Heather I haven't had a test that early but it doesn't sound like a bad value to me for 10DPO? As long as it keeps going up that is a good sign. You'll find the HPT's line darkness is also dependent on how much pee volume you have when you get up in the morning - the more morning pee, the less concentrated the HCG will be in it. Usually the HPT's need at least the levels to be at 10 or 20 to get a faint+ - the box would say how sensitive it is.

Hope your next test goes well - let us know how it goes?