Cerazette

Hiya ... I've been on the pill cerazette for 13 years and just recently I've had brown stains for 2 weeks then a period bleed which can last for nearly 3 weeks. Never had any of this before. But this is now the 2nd time it's happened. I'm 34 this year no children as of yet. I'm not sure if it's to do with my age or it just time to come off the pill. Any thoughts?