I think it's supposed to be this way...
it never rains but it pours
spoken used to say that as soon as one thing goes wrong, a lot of other things go wrong as well
For idioms, it's better to keep it the way it is...
Ex: First my car broke down, then I lost my key: it never rains but it pours!
For US normally they said : When it rains, it pours.
- For Teachers