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"When it rains, it pours." is indeed the correct term.
This expression says that when something bad happens, there is more to follow that is much worse. Almost like all of your bad luck comes at once.
It's possible that you have seen this posted as "It doesn't rain but it pours" to express a similar idea. This is definitely a comprehensible form for a native speaker but of course tough to pick up for an English student.