You said you had all your plumbing redone.
That does'nt mean it was done right.
What exactly was redone?
Was this a tub/shower or just a shower.
tile/fiberglass/ ?
You say you smell odors after you use the shower.
I could be possible it wasn't vented properly and the p-trap ( providing there is one) is not holding the trap seal.
Stand alone showers require a 2" drain and you should be able to look down into it and see water holding in bottom of drain.
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