I heard that the thing with the nails applies to all women, but pregnant women are especially careful, because their baby can be harmed. I heard there is a connection to Adam and Chava before the cheit. Their entire bodies were covered with a layer of nail like material. And after Chava gave Adam the fruit and they sinned, most of the nail covering came off and only remained on the fingertips and toes. Chavah was blamed for this, so all women who are decended from her, can “remind” Hashem or the satan or whoever when they step on a nail, who can be mekatreig against them.
Has anyone else heard this? Please correct me if I’m wrong.