When the blood of menses comes, it is black blood with can be recognized; so when that comes, refrain from prayer, but when a different type comes, perform ablution and pray. Abu Dawud said: Ibn al-Muthanna said: Ibn 'Adi narrated this tradition from his memory on the authority of 'Urwah from 'Aishah. Abu Dawud said: This tradition has also been transmitted by al-'Ala b. al-Musayyab and Shu'bah from al-Hakam on the authority of Abu Ja'far. Al-'Ala reported it as a statement of the Prophet ﷺ, and Shu'bah as a statement of Abu Ja'far, saying: She should perform ablution for every prayer.  

لَهَا النَّبِيُّ ﷺ إِذَا كَانَ دَمُ الْحَيْضِ فَإِنَّهُ دَمٌ أَسْوَدُ يُعْرَفُ فَإِذَا كَانَ ذَلِكَ فَأَمْسِكِي عَنِ الصَّلاَةِ فَإِذَا كَانَ الآخَرُ فَتَوَضَّئِي وَصَلِّي