Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

 

As a Muslimah, you ought to keep track of the days of fast you have missed due to menstruation or childbirth or even sickness or travel and make up for them.

 

If you have failed to keep a record of them, you need to make an educated guess. You should be able to refer to your standard pattern (regular days of menses) and calculate the total number of days you missed, accordingly and fast them. And try to observe some optional fasts as well. You can redeem yourself for your past mistakes doing so and asking forgiveness of Allah.

 

In future, you ought to keep a proper record of the days you miss due for such reasons and make up for them before the next Ramadan arrives.

 

If you find yourself unable to make up for them due to terminal illness, then you ought to expiate by feeding the poor. You ought to feed a poor for each day you missed.

 

Almighty Allah knows best.