Cycle Patterns-trying to pinpoint O

[Britmc24]

Hey all... im new to the site but i was hoping to reach out for some opinions and to see if anyone else has experienced cycle lengtg patterns.

I downloaded a period tracker about 3 years ago before I was married. I used it to track all my psm symptoms as i tend to have bad ones month to month.
Anyways hubby and i are considering trying to conceive so i have been working to pinpoint my O day, thats when i noticed that i have a weird cycle length pattern! I posted a pic and youll see i vary from 25-34 days but its always like 2 long cycles followed by 2 short ones.....what could this be caused by....
Someone tell me im not the only crazy

 

[AlexandraRJ]

I just got off depo a few months ago and we are TTC, but since my body is getting used to being off it my cycles are still wacky like that.

Have you bought ovulation tests yet? That's how I pinpoint my O day each cycle. I was given advice to test 11 days past my first spotting day which works for me.