Hello Good Evening, This might be implantation bleeding or OCP withdrawal bleeding: Implantation bleeding – a very early sign of pregnancy – occurs when the fertilized egg attaches to the uterine lining. During implantation, the fertilized egg (called a blastocyst at this stage of development) burrows and embeds itself underneath the wall of the womb (uterus). Because the uterine lining is rich with blood, some women can experience spotting and even cramping during this process. For the most part, implantation bleeding is lighter and occurs earlier than your regular menstrual period. Sometimes, however, implantation bleeding may be heavier, so it can be easily confused with a regular period. Frequent spotting or bleeding are very well known side effects of OCP withdrawal. So keep watch for period to come or missed period. Regards, Dr. Naresh Jain.