Progesterone??

Atty
I am currently on cycle day 56... still no AF or a BFP. I saw the doctor and they are going to have me start progesterone to kick start my period. Has anyone done this in the past and had luck with it? My only concern is that it will continue to mess up my cycle or that I may just be ovulating later and it would cause me to miss my chance this month. Opinions or thoughts?