Not graded
Sunan ad-Darimi 925
حَدَّثَنَا أَبُو الْوَلِيدِ الطَّيَالِسِيُّ عَنْ جَرِيرٍ عَنْ مُغِيرَةَ عَنْ إِبْرَاهِيمَ قَالَ لَا يَكُونُ حَيْضٌ عَلَى حَمْلٍ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 925).