During the last days of the menses before the (established) state of purity, the woman doesn't sees the traces of the menses. Does she fast for that day although she hasn't seen the clear discharge (which indicates the end of the monthly cycle), or what does she do?
If it is customary for her that she doesn't sees the clear discharge like what's found with some of the women (which indicates the end of the monthly cycle), then she is to fast. If it is customary for her that she sees the clear discharge (indicating the end of her monthly cycle) then she is not to fast until she sees the clear discharge.
- Fiqh and Fataawa