MICRONOR/ERRIN

I've been on Micronor/Errin for 6 weeks now (2nd packet) my dr.told me to start it on my first day of my Menstrual in January,so I started when told,take it every day at the same time,and my menstrual started in February and I'm bleeding heavily still. Does anyone know how long it takes for Micronor to work ? I feel that I'm bleeding the same amount as I was bleeding before the Micronor...I don't know much about the Micronor if someone else knows anything about it i'd love to hear from you and what you experienced while taking it .
Thanks