Why Am I Missing Menses After Taking Contraceptive Pill Cerazette?

Hi. I was taking the contraceptive pill Cerazette for two years, during that time I did not have a period. I should mention that during this time, I was put on 20mg of Fluoxetine daily, which I took for six months. After suffering terrible acne whilst on the pill, I decided to stop taking it, and my partner and I have decided to try for a baby. However, 8 months after coming off cerazette, I still haven't had a period or any bleeding, or in fact any pre-menstrual symptoms. Is anybody able to offer any advice, or been through a similar situation?