Purity: Status if No Blood Found After Prayer

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 406:

If a mustaḥāḍah examines herself after prayers and does not see any blood, then even if she knows that bleeding will start again, she can perform prayers with the wuḍūʾ she already has.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)