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Summary. 1  A period occurs when a femaleâs body sheds the lining of the uterus every 28 days. Implantation bleeding occurs in a pregnant woman when the egg travels into the uterus and into the lining. 2  Implantation bleeding occurs at the normal time a period occurs, yet the blood is dark red with a brown tint.
Causes of Vaginal Bleeding Between Periods. Bleeding between periods is not a normal part of the menstrual cycle. On average, the cycle is 28 days long with a four-day period of bleeding. A cycle between 21 and 35 days long and a period that lasts between two and seven days is normal.auses of Vaginal Bleeding Between Periods. Bleeding between periods is not a normal part of the menstrual cycle. On average, the cycle is 28 days long with a four-day period of bleeding. A cycle between 21 and 35 days long and a period that lasts between two and seven days is normal.