What is the ruling of the brownish discharge before and after menses (haidh)?
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If the brownish discharge comes at the usual time of the period or a little before it, then it is part of the menses and a woman should refrain from offering prayer during this full period.
With regard to the brownish discharge that comes after the bleeding and before the white discharge (that signals the end of the period), this is regarded as menses. It is narrated from `Alqamah ibn Abi `Alqamah that his mother, the mawla of `A’ishah (may Allah be pleased with her) said, “Women used to send little boxes to `A’ishah with a piece of cotton cloth in each one on which was yellowness from menstrual blood, asking her about the prayer. She said to them, ‘Do not be hasty until you see a white discharge.” By that she meant purity from menses. (Muwatta’ Malik)
For more information about the ruling of the brownish discharge of women, watch this short talk with Dr. Muhammad Salah.
Source: Huda Youtube Channel.