It was narrated that 'Aishah said:
Fatimah bint Abi Hubaish came to the Messenger of Allah (ﷺ) and said: I am a woman who suffers from Istihadah and I never become pure. Should I stop praying? He said: No, that is a vein, it is not menstruation. When your period comes, stop praying, and when it goes, wash the blood from yourself and pray.