I had one of our summer doonas doubled up under the fitted sheet on my side of the bed for my hips and figured that would be enough. I actually felt and heard my waters break and managed to make it to the tiles in the ensuite anyway.
We also bought a new mattress when I was pregnant and decided it was worth spending the $100 for a waterproof mattress protector. They're not plasticy, you don't even notice they're there. And while my waters didn't break in bed, I've been pretty thankful that we made that purchase decision in the couple of years since - BM smells awful when it dries on something and toddler vomit comes without warning.
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