One common cause of spotting several days before a period is low progesterone. Progesterone helps to maintain the uterine lining for pregnancy, and when progesterone levels drop, the menstrual cycle occurs. Progesterone-deficient women will see spotting several days to a week before their period is due. This can affect fertility and in some cases causes miscarriage. You can discover more about spotting in recommended link above.
Spotting can happen while you are pregnant, so take a pregnancy test or visit your doctor to confirm.
Light spotting followed by no period is actually one of the first signs of pregnancy.
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