Missed period but pregnancy kit negative

Hi, I tested for ovulation using ovulation kit this month and got a positive on one of the day. So I should come period 14days later after the ovulation which is my typical luteal period cycle but on the first and second day that I missed my period, I tested using pregnancy kit and it was negative. Any one knows the reason? Because I thought luteal period should be fixed.

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ovulation kits can show positive for many days.. the counting might be a bit off if you use fixed 14 days. luteal phase can vary!