Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
darimi:965Abū al-Nuʿmān > Thābit b. Yazīd > ʿĀṣim > ʿIkrimah And Mā Taghīḍ al-Arḥām al-Rʿd 8 > al-Ḥayḍ > al-Ḥabal Wamā Tazdād al-Rʿd 8

[Machine] ‘Ikrimah said, "And the uterus contracts" (Al-Ra'd 8). He said, "It is the menstrual period that occurs on a regular basis." (Al-Ra'd 8). He said, "So she continues to menstruate every month during her pregnancy, and her purity increases until she completes nine months free of impurity."  

الدارمي:٩٦٥أَخْبَرَنَا أَبُو النُّعْمَانِ حَدَّثَنَا ثَابِتُ بْنُ يَزِيدَ حَدَّثَنَا عَاصِمٌ

عَنْ عِكْرِمَةَ {وَمَا تَغِيضُ الْأَرْحَامُ} [الرعد 8] قَالَ «هُوَ الْحَيْضُ عَلَى الْحَبَلِ» {وَمَا تَزْدَادُ} [الرعد 8] قَالَ «فَلَهَا بِكُلِّ يَوْمٍ حَاضَتْ فِي حَمْلِهَا يَوْمًا تَزْدَادُ فِي طُهْرِهَا حَتَّى تَسْتَكْمِلَ تِسْعَةَ أَشْهُرٍ طَاهِرًا»