Face change during Invisalign treatment. How long will it take for it to go back if I stop now?

ok so ive been on invisalign treatment for about 5 months now to close the gaps and fix my bite but recently ive noticed that my face shape is changeing a lot especially in the mouth and cheek area it looks like ive lost weight on my face which I'm pretty sure I didn't loose any weight. will my teeth and face shape go to its orginal position if I stop the treatment now ? .how long will it take for it too go back if I stop now ? and is it possible to wear invisalign in reverse ?

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