Is the fast of one who took birth control pills five days after her period and did not become pure, then fasted ten days after her period while still not clean, considered valid or not?

If a woman fasts before the end of her menstrual period, her fast is invalid by scholarly consensus. The end of menstruation is known by the completion of its usual days, or by distinguishing between menstrual blood and other blood if she does not have a regular cycle, or by referring to the typical menstrual period of women similar to her. However, if she fasts after menstruation has ended, her fast is valid even if bleeding continues, because it is then considered irregular bleeding (istihada). It is permissible to use pills to delay menstruation, provided that they do not cause harm, do not contain impurities or forbidden substances, and that the husband's permission is obtained if they delay conception. It is preferable to avoid using these pills.