well it could highly be likely that it is the same one, some women have a bleed when there period is due, which they can mistake for their period or a miscarriage and the pregnancy carrys on as normal, if it was acompanied by cramps and clots then it would prob be a miscarriage, bloods would be best as depending on which one the do it will measure the preg hormone and it should continue to rise, good luck
Well thats all depending on if you saw your period again to start your cycles...however if you just had a miscarriage you have to wait for the pregnancy hormone to clear from ur system otherwise all test will come back positive as the body still has to catch up with whats happening...Im sorry to hear you had a miscarriage i just had one myself