Invisalign - Tooth Chip?

I started my 3rd set of Invisalign trays on Tuesday, when I also got "buttons" put on some teeth. This afternoon I had my tray out to eat and noticed that there was a small chip in one of my teeth near where it meets the other tooth (bottom side of mouth). I don't have any pain and the whole left is small but visible. Is this caused by the trays or buttons? Should I be concerned about more teeth chipping? Of course, it is a holiday weekend, so I won't be able to reach the dentist until Tuesday.

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