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  • Fasting_by_Ghazali, page : 17

had a valid excuse i.e. menstruation, illness, travel etc.

However, if sexual intercourse occurs during the fast of Ramadan, its
expiation will be to fast for two consecutive months. If those who indulged in
intercourse are unable to fast the two consecutive months then each should
feed sixty poor people as a means of expiation.

In the case of a woman whose menstruation finishes during the day, there is
no obligation upon her to practice the fast for the rest of that day. If a woman
is pregnant or breast feeding and cannot fast on account of her child, it is
obligatory for such to fast the days that are missed later on, or feed the poor
with the equivalent of a bushel of wheat for each day lost.

There is no obligation upon a non-fasting traveler to resume the fast upon
reaching his destination before the end of the fasting day, however, it is
preferable for the traveler to fast the entire day unless it incurs more than the
usual hardship of fasting. In the event that a person has already started
fasting, he should not break the fast when he embarks upon journey, nor yet
when he returns from a journey.