“Some women’s periods
finish at the end of the night and they know that they have become clean but
they don’t fast that day under the assumption that if they do not take a ghusl their fast will not
be correct – but that is not the case, their fast is correct even if they
didn’t take a ghusl
except after the emergence of Fajr."”
(Fiqhul-Ibaadaat, p. 254.)
