(Imām Bukhārī narrates): Ahmad bin Abi Raja narrated to us, he said: Abu Usamah narrated to us, he said: I heard Hisham bin Urwah, he said: My father informed me, from Hazrat Aisha (may Allāh be pleased with her), that
Hazrat Fatimah bint Abi Hubaish (may Allāh be pleased with her) asked the Prophet ﷺ that my blood continues to flow, so I do not become pure; should I leave prayer? He said: No! This is (blood from) a vein; but leave prayer for as many days as you used to menstruate, then bathe and pray.
Reference: Sahih Al Bukhari 325