Over 2 weeks period!

So I'm on the pill co-Cyprinol but I've never had a period on it (taking it for about 3 months) and I had like an ishy browny period last week and now one day it'll be nothing next day full on period next day browny! What is wrong with me šŸ˜–šŸ˜–šŸ˜–šŸ˜–šŸ˜–