أَخْبَرَنَا مُحَمَّدُ بْنُ عِيسَى، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، عَنْ يُونُسَ، عَنْ الْحَسَنِ فِي الْحَامِلِ تَرَى الدَّمَ، قَالَ: "هِيَ بِمَنْزِلَةِ الْمُسْتَحَاضَةِ، غَيْرَ أَنَّهَا لَا تَدَعُ الصَّلَاةَ".
It is narrated from Yunus bin Ubaid that Imam Hasan al-Basri, may Allah have mercy on him, said regarding a pregnant woman: If she experiences bleeding, she is under the ruling of mustahadah (a woman with irregular bleeding), and she will not abandon prayer.