What Causes Irregular And Prolonged Periods When On Cerazette?

i am taking cerazette and mercilon as directed by my gp. i an 47 yrs old have fibroids and took cerazette for four months but it did not agree with me. proloned and iregular periods. i weight 11st 9 pounds. i was told to stop cerazette when the pack finishes in three weeks.