Been ttc for a year!!

Beckii
Was on depo for 3 years! Stopped a year ago, so been trying to conceive a full year this month!! 
Anyway, I avoided these charts and etc, cos every month when my period do or don't come it's upsetting as my cycle messed up!
So had a  work meeting today, out of nowhere my lower back been hurting.. But is just on left side! 
But checked my app, it's says ovulation occurring tomorrow!! Could this be me actually ovulation for a change??? Hope so!!