What the what?!

So today is CD10 for me and also the day I always start testing with OPKs.  Up until now I always get very clear negatives until the positive.  I've never really had a fade in pattern to mine.  Anyway, after testing today I got this:

I'm pretty sure that is still negative, but it is so close to positive it has me scratching my head.  Is the Metformin screwing up my OPKs or am I going to O so early I won't even get to trigger this cycle?  I don't go in for monitoring until Wednesday so I'm praying this is just a fluke.  Ahh!

What do you all think?

-L