Does ovulation time change each cycle?

Each month my cycles varies by a few days but I get my period more on cd 29 and 30 but last month I've got it on cd 36 and this month on cd25
​Does ur ovulation date changes too??
​And what can be the reason of my cycle being from 36 all the way to 25? Or did I get it early cause I got it late last cycle and is it just trying to even it out? Ttc first month now so I'm all new to this stuff, help would he much appreciated, thanks! Oox 
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