sudden change in cycle. cant track ovulation anymore?

So we've been trying for 6 months now. Not very long but it feels like forever! I was on a 33 day cycle then one month of 35 days then 33 again and now 31. I don't understand why it keeps changing but I can't track my ovulation anymore. Is there any way to regulate my period. I was on the patch birthcontrol last may so maybe this is why. Our backup plan for now is using preseed lub but for my cycle, how can I regulate it? Thanks
 
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