Are the days exceeding the normal menstrual period (8 days) considered istihadah (non-menstrual bleeding), given that an IUD (hormonal coil) was inserted, which increased the duration of menstruation to 15 days, with a change in the color of the blood in the last days, the appearance of the "qassah al-bayda" (white discharge indicating the end of menstruation), and then the return of blood with a brown color, followed by yellow?

If the menstrual period exceeds fifteen days, the woman is considered to have irregular bleeding (istiḥāḍah). She should revert to her previous regular habit and perform ablution (wuḍūʾ) for each prayer, taking precautions. During the period of irregular bleeding, she has the rulings of ritually pure women. However, if the period does not exceed fifteen days, then all that she sees of blood, yellowish discharge, or brownish discharge is considered menstruation. If she sees purity by one of its two signs (dryness or the white discharge) and then sees blood thereafter, she reverts to being a menstruating woman as long as it is within the possible timeframe. As for yellowish and brownish discharges after purity, they are not considered menstruation.