Imam Ibrahim Nakha'i (may Allah have mercy on him) said: Menstruation does not occur during pregnancy.

Imam Hasan, may Allah have mercy on him, regarding a pregnant woman who experiences bleeding, said that she is like a mustahadah (a woman with non-menstrual bleeding).

Imam Ibrahim Nakha'i (may Allah have mercy on him) said: When blood comes to a pregnant woman, she should not abandon prayer.

It is narrated from Hajjaj bin Arta’ah that both ‘Ata and Hakam bin ‘Utaybah (may Allah have mercy on them) said regarding a pregnant woman and a woman whose menstruation has ended: When these two women see blood, they should perform wudu and offer prayer; they do not need to perform ghusl. (That is, this blood will not be considered menstruation, rather the ruling of mustahadah will apply to them.)

It is narrated from Ata (may Allah have mercy on him) that both those women should perform ghusl and offer prayer.

It is narrated from Ata bin Abi Rabah (may Allah have mercy on him) that Sayyida Aisha (may Allah be pleased with her) said: A pregnant woman does not menstruate; when she sees blood, she should perform ghusl and pray.

It is narrated from Imam Hakam bin Utbah (may Allah have mercy on him) that Imam Ibrahim Nakha'i (may Allah have mercy on him) said regarding the woman who experiences bleeding at the time of labor pains: That is menstrual blood, therefore she will abandon prayer.

Imam Hasan al-Basri, may Allah have mercy on him, regarding a pregnant woman who begins to experience pain and sees blood for the child, said: She will not pray. Imam Darimi, may Allah have mercy on him, said: She should pray until she gives birth.