Stray marks on answer bubbles?

<p>Well, two minutes before the proctor snatched my paper, I was going back and re-doing some of the bubbles. I erased the mark and made a really nice, very dark mark on the bubbles, but the erase smudged a bit and left a tad bit of mark. I'm scared the machine might read that and misinterpret. Should I worry?</p>

<p>Hmm now that I think about it I can’t remember if I erased the 2 questions I circled lightly, damn.</p>