hello99: that’s where you’re mistaken. look in the sefer chok uz’man on hilchos nida and you’ll find many clear mekoros discussing nittel in ALL of the places you mentioned. The sources of this minhog go all through the t’kufos of the Rishonim, kadmonim, down to ach’ronei ach’ronim, and in ALL parts of k’lal Yisroel… (MAYBE besides the Teimonim)…
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