Answered by Shaykh Yusuf Weltch
Question Summary
How do I determine when my menstrual period is over?
Question Answer
In the Name of Allah, the Most Merciful and Compassionate
If you see any color other than white, regardless of the color, the menstrual period is still present. [Tahtawi/Shurunbulali, Hashiyat Maraqi al-Falah]
There are essentially three ways one can be sure that their menstrual period is finished, and they must return to praying/fasting, etc… These ways are explained below:
1) One sees a pure white discharge at the end of their period. [Ibid.]
2) The bleeding stops at or after their menstrual habit such that one is reasonably sure that it will not return. Note the menstrual habit is the length of the previous menstruation. [Ibid.]
3) The bleeding continues beyond the maximum length of menstruation: 10 days; in this situation, despite the presence of blood, the menstruation is considered over, and now irregular bleeding has taken its place. [Ibid.]
If any of these situations occur, she must perform the ritual bath (ghusl) and act as she would when pure.
I hope the clarifies the issue
Allah bless you
[Shaykh] Yusuf Weltch
Checked and Approved by Shaykh Faraz Rabbani