Is a woman's fast valid if she miscarried a fetus of six weeks' gestation during the day in Ramadan and completed her fast, considering the blood discharged as corrupt blood and not nifas blood?

The blood that prohibits fasting and prayer is menstrual blood or post-natal bleeding (nifas). Blood discharged after a miscarriage is not considered nifas blood unless the fetus was formed. The minimum period for its formation is eighty-one days. If the fetus was not formed, then the blood is considered irregular bleeding (dam fasad) which does not prohibit prayer, fasting, or sexual intercourse. Therefore, the woman's fast is valid, and she does not owe any missed fasts.