What must I do regarding the days I did not fast during pregnancy and breastfeeding due to inability, knowing that I vowed to fast three days each month?

A vow (nadhr) is when a legally responsible person obligates themselves to an act of worship that was not originally obligatory upon them by Islamic law. Vowing to fast three days every month is considered a vow of obedience that must be fulfilled, based on the Prophet's (peace be upon him) saying: "Whoever vows to obey Allah, let him obey Him." The days that were not fasted due to pregnancy or breastfeeding must be made up after the excuse is no longer present, as stated in the fatwas of the Permanent Committee.