None of the trustworthy scholars have stated that a woman has to wash her feminine pads which may have traces of menstrual blood, if she is going to throw them away and not use them again.

Menstruating women are not forbidden to enter Makkah or Madinah. There is nothing in the texts to suggest that they are not allowed to enter these cities.

Unintentional miscalculation of menses is not a sin. If a woman thinks that she has become pure and starts praying and fasting, then she realises that she is still menstruating, then she has to stop praying and fasting until she becomes pure, and she should make up the obligatory fasts that she observed during that time.

Muslims scholars agreed that it is prohibited for a menstruating woman to pray, whether that is obligatory prayers or supererogatory. Based on this, if a woman does that she has to repent to Allah and to seek His forgiveness for what she did.

The correct scholarly view is that if a woman miscarries a foetus that was fully formed, then she should stop praying and fasting because this is postpartum bleeding. If the foetus was not fully formed, then her blood is irregular bleeding and she should not stop praying and fasting.