Why am I ovulating later then usual

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I have been trying for 8 months and tracking my cycles. (Have 2 kids) I always have a regular 28 days cycle and ovulate cd 13 perfectly for the last 8 months.
I am currently on cd16 and have still not ovulated this month.
Is there any reason for this? Does it change anything? Am I out this month?

Thanks for your responses x

Stress, illness, just a random month, all sorts can affect ovulation op hope it happens soon!!