According to MedGuidance.com, spotting a day or two before a period is a normal occurrence in women. Spotting before a period sometimes means that a woman is ovulating or that a fertilized egg has implanted in her uterus.
MedGuidance.com says that women who are on birth control sometimes experience spotting before their period as well. It is also common in adolescents who are starting to menstruate. However, spotting more than two days before a period is sometimes an indication of another more serious condition such as low hormonal levels, cancer or uterine fibroids. The color of the blood spotting before a period varies in color and can be dark brown, brown, dark red or pink.