There are three possibilities: First: If fasting harms the pregnant woman or harms her fetus, then it is prohibited for her to fast, and she should make up the missed days later. Second: If she is close to delivery, and fasting is a strain for her, she is permitted to break the fast and pay the fidya, and make up for the missed fasts later. Third: If fasting does not harm the pregnant woman or her fetus, then it is obligatory on her to fast.