I think you should go for a blood test. I miscarried at 14 weeks and got a negative pregnancy test at 3 weeks post miscarriage and my hcg levels were at 5 at 4 weeks post miscarriage. You could be. Just go to the doctor and say you want to make sure your levels have gone down.
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it is possible that there is still hcg in your body after your miscarriage .. mine didn't come down until my first af arrived .. have you had an af yet? get a BT if you think there could be chance .. I do know of people who have gotten pg again before their first af and you could be one of those .. good luck!!!
You probably still have some hcg in your system. I finally had a level of 0 after 4 weeks. Is your doctor doing any follow-up to make sure your levels are going down?