Sheikh Salman al-Oadah
Scholars disagree regarding the legal status of the blood that a woman sees during pregnancy. Some say that it should be not regarded as menstrual blood. Amongthe Successors, this was the view of Sa`îd b. al-Musayyib, al-Hasan, Hammâd b. Abî Sulaymân, `Atâ’, al-Hakam b. `Utaybah, Ibrâhîm al-Nakha`î, al-Sha`bî, Sulaymân b. Yasâr, and Nâfi` the ward of Ibn `Umar. It was also one of the views expressed by al-Zuhrî.
Among the leading jurists who came after them, it was the view of al-Thawrî, al-`Awzâ’î, Abû Hanîfah, Ahmad b. Hanbal, Abû `Ubayd, and Dâwûd al-Zâhirî.
They argue that the blood during this time is redirected to the womb to nourish the child.
This is why the Prophet (peace be upon him) said regarding the waiting period of the women of Awtâs: “Do not engage in sexual relations with any of them who are pregnant until she gives birth or with any who is not pregnant until she passes one menstrual period.” [Sunan Abî Dâwûd (2157)]
Likewise, this is why the Prophet (peace be upon him) permitted divorce with a woman who is pregnant but forbid it when a woman was is on her monthly period.
The second opinion on the matter is that such blood should be considered menstrual blood. This was the opinion of `A’ishah among the Companions. Among the Successors who held this view were `Ikrimah and Qatâdah. It was also one of the views expressed by al-Zuhrî.
Among the leading jurists who came after them, it was the view of Rabî`ah, Mâlik b. Anas, al-Layth b. Sa`d, al-Shâfi`î, and al-Muzanî.
The view that I consider to be stronger is the first, which is that such blood is not to be regarded as menstrual blood. The evidence to support this view is strong and clear. It is also in accordance with modern medical knowledge.
And Allah knows best.
Based upon this opinion, a pregnant woman should pray and fast and she may have sexual relations with her husband even if she sees blood. The only exception to this is blood that may be seen just before delivery. This is regarded as post-natal blood (nifâs).
Source: Islam Today