Are you wondering why you are spotting? I would like to help, but I need more information. When is your period due? Sometime you can spot a few days before a period begins. May I ask how old you are? Teens who have just begun to menstruate and women who are approaching menopause may notice irregularities in their menstrual cycle. Have you had unprotected sex? Implantation bleeding, which can last one to two days and is lighter than a normal period, occurs when the fertilized egg attaches to the lining of the uterus.