I recently saw on Wikipedia something I had never heard before: that for newlyweds, "a bride counts only four days before performing a hefsek tahara, instead of the usual five." No citation was provided and I am not sure what this means, or it if is true.
Is this true? What is the source?
What defines a "newlywed" couple? Is it for the first year of marriage, the first cycle, or...?
Does it have anything to do with whether the woman is a betulah at marriage?