I've had a roll of this sitting in one of my 35mm cameras since last October. It's only on frame 6, and I'm wondering whether it's still any good. Should I continue to finish the roll or should I just trash the roll? (I don't mean to be wasting a good roll of film...I was shooting last fall, and then I had my son in mid-October, and so haven't had a chance to pick up that camera again until now!)