Yes, you can fast.
If your menstrual period ends after Fajr (the dawn prayer), you are permitted to fast. Islamic jurisprudence emphasizes the importance of certainty regarding the cessation of menstruation. The provided reference clarifies that once a woman is certain her period has ended, she may intend to fast even if she hasn't performed the ritual cleansing (ghusl) before dawn. The focus is on the ending of the menses, not the completion of ghusl before Fajr. She should, however, aim to perform ghusl as soon as possible to pray Fajr on time.
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Key Takeaway: Certainty about the end of menstruation is paramount. Intention to fast is valid even if ghusl is performed after Fajr, provided menstruation has undoubtedly concluded.
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Example: If your bleeding stops at 6:00 AM and Fajr prayer is at 5:00 AM, you can still fast that day. Make the intention to fast upon certainty that your period has ended.
