How much does your ovulation day vary?

C

My cycles are pretty regular however I have been taking digital opk's and my ovulation day varies from CD 13 - 19 with 15 being the most common. My cycle reflects this as if I ovulate on CD 13 I have a 27 day cycle, and if I Ovulate on CD 19 I have a 31 day cycle. Just interested to see if anyone else is like this?

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