Still hopeful...but what do you think?

I have had preg symptoms for the last week and a half or so...nausea, sore boobs, light cramping, very emotional (that's what my husband says anyway), moody, very tired, peeing constantly...I think i got them all.  Anyway, I started spotting a very little a few days ago, just when I wipe.  It wasn't much.  AF was due today and it was enough to have to wear a small pad, but still not nearly as heavy as usual, mine are always very heavy on the first day.  I had a BFN about 3 days ago... Could this have been implantation bleeding, or do you think AF is playing games?