My home smells and I have a septic system

it does not stink all the time . we have slab home it is just about 10 years old. but mostly I have noticed when we get a rain I can smell it in the one bathroom . it is terrible. if we needed to clean out the septic would it not give is trouble flushing? I just don't know what to do or check I just know it is terrible!!can anyone tell me where to start checking?
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