I presume you had a complete hormonal work up before the diagnosis was made. Your menstrual cycles are not normal, they are metropathic. Your cycles need to be corrected first for which your doctor can put you on oral combination pills along with metformin
and follow up later with other medication as needed like ovulation induction
etc. The dosage of progesterone
that was given may not have been sufficient and so, you are getting this breakthrough bleeding
. See your doctor for further management. Wish you good health.