Not graded
Sunan ad-Darimi 926
أَخْبَرَنَا سَعِيدُ بْنُ عَامِرٍ عَنْ هِشَامٍ عَنْ الْحَسَنِ فِي الْحَامِلِ تَرَى الدَّمَ قَالَ هِيَ بِمَنْزِلَةِ الْمُسْتَحَاضَةِ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 926).