Answered by Shaykh Faraz Rabbani
Can I make up prayers even when I am spotting, after 10 days of menstruation are over?
Walaikum assalam wa rahmatullah,
I pray that this finds you well, and in the best of health and spirits. May Allah grant you all good and success in this life and the next.
Yes, istihada is a state of effective tahara, and it would be valid to perform make up prayers at this time. [ Shurunbulali, Maraqi al-Falah ]
And Allah alone gives success. Faraz Rabbani