A few quick questions - Have you seen a doctor since the miscarriage, and if so did they do any bloodwork? If they did, any chance you know what your hCG was at the time? Depending on how quickly your hCG decreased following the miscarriage, it seems theoretically possible that you could test positive still, and I know your miscarriage was at the very end of your first trimester and your hCG would have been very high at the time... but my guess is that by nearly two months later your hCG would have returned to zero. Before now, have you done any HPTs since the miscarriage? If so, were they negative?
I agree with nunceo that 10 DPO is about the soonest you'd test positive if this is a new pregnancy. The best way to tell right now, I'd think, would be to keep testing each day and watch to see if the line gets darker. If it does, that would indicate that your hCG levels are increasing, ie. this is a new pregnancy. Blood tests will be more sensitive of course, and if you continue to see a positive result you could have one done (even at a clinic, rather than your regular Dr.) and find out what your hCG levels are. If you have two blood tests in succession a few days apart and your hCG levels are increasing, then you can be certain it's a new pregnancy.
I know I said it at the time, but I am really, really sorry about your earlier loss.
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