'Waterworks' - yes, I remember that, too.
What got me about my colleague was that something had gone wrong in her body, something potentially life-threatening to her baby, something she didn't understand, yet it didn't occur to her to ask for clarification.
It was also even more unclear than 'waterworks'. At least that was understood to mean the bits of your body that 'make water' (an old euphemism for peeing). So a "water infection" meant a UTI. But "waters", particularly in reference to a pregnant woman, always referred to the amniotic fluid.