What is to be done if there is doubt as to whether the blood that appeared was menstrual, and more than a month has passed since the Hajj, and the major disengagement (al-tahallul al-akbar) has been completed?

The characteristic of blood is not considered unless the duration of menstruation exceeds fifteen days. As long as you are close to Mecca, if the blood is menstrual, you must return to Mecca and perform circumambulation (Tawaf) and the ritual walking (Sa'i). You are not required to offer a fidyah (expiatory sacrifice) for the prohibitions of ihram, as they are lifted by the first partial disengagement (tahallul al-awwal), except for sexual intercourse. If sexual intercourse occurred due to ignorance of the ruling, it is hoped that nothing will be incumbent upon you.