Is it ok to wear my retainers after going about 6-7 months of not wearing them?

I have recently started wearing my retainers (has only been a day) and they did not fit perfectly, but I still managed to get them on. The bottom fit

I have recently started wearing my retainers (has only been a day) and they did not fit perfectly, but I still managed to get them on. The bottom fit better than the top but will it shift my teeth back into place? The bottom ones are already shifted back but what about the top?

or:I have recently started wearing my retainers (has only been a day) and they did not fit perfectly, but I still managed to get them on. The bottom fit better than the top but will it shift my teeth back into place? The bottom ones are already shifted back but what about the top?

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