My teeth have moved a bit. Will my retainer help them go back?

I have had my retainer for 9 months,but recently I have only been wearing it at night and once in a while ill forget to even put it in at night.I am supposed to wear it as much as possible,and i have a orthodontist appointment in 5 days,My teeth haven't moved a lot but my gap in the front is getting a bit bigger. Thanks.

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