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Hi, It's Dr. C Board certified Ob-gyne. I can help you today.
It's not days AFTER the period but days BEFORE the period that is important. Ovulation occurs 14 days BEFORE the next period comes. So for example with a 28 days cycle, the ovulation is day 14. But with a 30 day cycle, it's day 16. With a 32 day cycle, it's day 18.
We count the days from Day 1 being the 1st day of the period until the 1st day of the next period.
I hope this was helpful. Let me know if I can clarify anything. Good luck!