I heard most of these from my mother when I was a child, and I still use some of them. But my mother’s family was from southern Ohio, and never set foot in Arkansas.
Not long ago I used the expression, “can’t make a silk purse out of a sow’s ear,” to someone in their 20s. She looked at me like I’d just arrived in a spaceship.
I’ve always thought of “caught short” as meaning left unprepared in a general way, I hadn’t been aware of the specific pregnancy angle.
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I’m in the UK and I know “caught short” as meaning needing to use the loo rather badly in the absence of a suitable toilet as in “I was caught short and had to find a bush to go behind.”