When you have blood again a week after your period, there are two things to be concerned about, one is the duration of the bleeding and the other is the amount of bleeding. A normal woman’s menstrual cycle is between twenty-one and thirty-five days, but most are in the twenty-eight to thirty day time frame. This bleeding occurs in the middle of the menstrual period, and if the bleeding is unusually heavy, approaching or exceeding the usual amount of menstruation, dysfunctional uterine bleeding is considered to be more likely. If the bleeding is light and stops naturally after three to five days, it may be ovulatory bleeding in the conventional sense, caused by hormonal deficiencies.