The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, narrated to me from Ahmad ibn Muhammad, from his father, from Al-Husayn ibn Al-Hasan ibn Aban, from Al-Husayn ibn Sa’id, from Muhammad ibn Khalid Al-Ash’ari, from Ibn Bukayr, from Zurara, from Abu Ja’far عليه السلام, who said: I asked Imam عليه السلام about a menstruating woman who stops menstruating after the usual number of her days. What should she do? Imam عليه السلام عليه السلام said: "She should wait for an additional day or two as a precaution. Then, if the bleeding continues, she is considered to be in the state of istihadha (irregular bleeding). She should perform ghusl, ensure her cleanliness, and pray each prayer with a fresh wudu unless the blood flows excessively. If the blood flows beyond the cotton pad, she should perform ghusl again and then pray."