Reference:: Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. no.12082
Fataawa Ramadhaan v2 p461 no.394
Question: What is the ruling of the one who bleeds whilst fasting?
Response: If the person was to bleed without intention whilst fasting, then his fast is valid.
And with Allaah lies all the success, and may Allaah send prayers and salutations upon our Prophet Muhammad ﷺ and his family and his companions.
