Skip fasting and make up the days you missed. If you began the day fasting and then got your period, break your fast but try not to eat in front of people who are fasting, so they don’t get the wrong idea. Do not keep fasting if you get your period because that would be a type of deception. If you have period and it ends in the middle of the day, fast the remainder of the day, but you will still make that day up later.
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Shaykh Mustafa Umar