Yea, using Aldara before getting the biopsy done might have been a factor. That's why I said I would rather do the biopsy and test for HPV before getting a(nother) biopsy done.
Maybe the Aldara treatment was kind of successful, activating your immune system which in turn was then able to fight the virus itself. Maybe that's why they didn't find it. Or, there might have never been a virus involved.