Hi, It could most probably be your regular cycle because you followed withdrawal technique which has less chances for pregnancy. Maybe the pill is causing heavy bleeding. Wait for 7 days from day 1. If it continues after that and if it is heavy then you need to control your bleeding with medication under prescription. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Archana Rajesh Babu, OB & GYN Specialist