Is irregular, light red blood that came at the time of the menstrual period considered menstruation (hayd) or abnormal bleeding (istihadah) that prevents prayer?

If a woman has a known menstrual habit, she should act according to her habit, even if the color of the blood changes. Menstruation is the period of blood discharge that aligns with her habit, during which she avoids prayer and whatever else a menstruating woman avoids. If the blood flow is interrupted by a period of purity, scholars have differed regarding its ruling.