My bracket fell off; should I be concerned?

I'm getting my braces off on the 28th of this month but when I got the colors changed, the dental assistant said it was fine and left it as it was but I can easily move the bracket with my tongue. Should I be concerned? I can't get back into my orthodontist until the day I get my braces off but I'm worried the bracket not being on will mess up my teeth and I'll have to wear them longer.

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