Period ovulation help

Amber
Why do my periods always start on the Sunday before the month ends? I stopped using the birth control patch 5 months ago. And for 2 months seems like my period always lands on Sunday it's supposed to start Sunday the 23 this month. Does this mean my cycle is back on track since quitting birth control? Any other women have the same cycle if you do what day do you usually ovulate ?  I can never seem to pin point my exact day but I know it's there ? Advice