Ttc please help

I was on the depo provera for 9 months(3shots) my next appointment was suppose to be on November 2013 I decided To get it for personal reasons, my period was sort of going off in the month of December. I did not get on any birth control after & I've been trying since with no luck:/ this app helps me keep of track when I ovulate I've been having intercourse of my most fertile days but NOTHING. What's wrong with my body?/: