Have you filled up space since then? As in have you deleted it, and then filled up that space on your harddrive?
If not, (or if you're lucky) you can plug your phone into your computer and run some recovery software.
Make sure that the software is made and supports your android version, though.
From my experience, even a day or two too late, and it might be gone forever.
Although, if it's REALLY important you can take it to a tech store and ask them.
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