I heard this 'You ever wonder what would have happened if we hadn't have gotten pregnant?'
Is this right?
Why not just '...if we hadn't gotten pregnant?'
It's a common incorrect usage; people sometimes throw in a "have" after the "had/hadn't", as is correct after the "would/wouldn't" in the other half of the sentence. Watch UK soap Eastenders for this kind of thing.
It's a mutation that has developed a sense of correctness because enough people mirror one other making it. I think it may be the rhythm of it - the extra syllable - that people find appealing, because adding the "have" there makes it equal on each half: "would have done (3 syllables), had have done (3 syllables)".
For those who think this is a one-off irrelevant thing, just try googling: a) "If you hadn't have done" and b) "If you'd have done" to see how embedded and accepted such mutations become.