´It was narrated from 'Amr bin Az-Zubair that Fatimah bint Abi Hubaish told him that she came to the Messenger of Allah and complained to him about (continual) bleeding. The Messenger of Allah said to her:` "That is a vein. Look and when your period comes, do not pray, and when your period ends, then purify yourself and pray during the time between one period and the next."
Hadith Referenceسنن نسائي / كتاب الطلاق / 3583
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف، إسناده ضعيف، تقدم (212) انوار الصحيفه، صفحه نمبر 347