I started spotting last night.  It was very light, so light that it could have been my imagination.  But this morning it was a bit darker.  And within a few hours I was bleeding pretty heavily.  My periods always start out like that, 12-24 hours of spotting before the heavier bleeding.  So it looks like this might just be my latest period ever, although an early miscarriage is certainly possible too.  Either way, it looks like it will probably be back to the drawing board for us.