Cerazette birth control bleeding

Patient: I have been on this pill for a month and a half but have been bleeding for the past 15 days. Is this just my body adjusting to the pill or is there a problem?? It is not the heaviest period and subsides at night time however, when I wake up and take the pill I start to bleed again! This is very frustrating and would be grateful to know if anyone else has experienced the same thing? And if bleeding can carry on for much longer than 15 days?? Any help would be great!!!