The normal length of bleeding for women is 2 to 7 days. Anything longer than 7 days is known as prolonged bleeding. Prolonged bleeding tells your physician that either ovulation is not occurring regularly or that there may be something disrupting the lining of the uterus. There also could be a problem forming blood clots. Prolonged bleeding can occur if the aforementioned ovulation is not occurring regularly.
Additionally, prolonged bleeding can be caused by polyps, fibroids, or infection within the uterus or cervix. In these situations, if an embryo should enter the uterus, implantation can be compromised, resulting in lower pregnancy rates or an increased chance of miscarriage. Although rare, a problem with blood clotting can also cause prolonged bleeding, which would necessitate an evaluation from a specialist.