Is this just variance?

[MathBabe]

Check out my winnings graph for the last week. Is this just normal variance? I've never had a downswing like this before.

I've lost $315 in 1,348 hands of $2/$4.

EDIT: I'm looking up more info...

sjay2k reminded me what else I meant to say... I'm admittedly not a winning player, but I don't lose as much as I gain in bonuses. For the first 7,000 hands I played at Full Tilt I averaged 0.73 BB LOST per session.

In the 1,000 hands starting on the 10th, I've been down 8 BB/100. This bothers me.