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TTC: USA

Does ovulation day keep on changing?

Does anybody else have this? My ovulation day keeps on changing. One month I peak at cd15 night,then another month it is at cd14 morning. This month it was yesterday morning,which would be my CD11. What should I make of this? Before I started trying to conceive my cycle was always 28 days, ever since I first got my periods at 13. Even after my first pregnancy it didn't change. But this time around it's all over the place ever since we started trying. One month it's a 30 day cycle, another month it's 24,then 30 again,then it goes to 28,then sometimes 26. Does anybody else have this?!!!