Are Hormones The Cause For Irregular Periods Post Copper T Insert?

hello, i'm 33 yrs old. I'm having 3 yrs old daughter. One year after delivery i insertted copper T and after 1 yr i removed that. But after that i'm having irregular period problem. Period comes after 2-3 months. Doctor says there is a harmone creation prblm. She says harmones r not creating in ur body. i need ur help.