A few years ago, I was taking Alesse and stopped taking it for about 15 months. I didn't get period for the first 6-7 months and then got them back but it was very unregular. I was told by the doctor my ovaries had went numb not ovulating for the 5 years I had been on the pill. After 15 months off the pill (and 7-8 months of unregular periods) I decided I might as well go back on it, wich I did.