Long luteal phase

Yalda • Expecting IVF babies in March 🤰🧿

So I got my positive opk on cycle day 9 and ovulated on cycle day 10, my cycles are 28 days, and regular , I always start spotting on cycle day 24, so like 14 dpo, but the flow starts on 28 dpo, so my luteal phase is 17 days 😫, what could be wrong ? I have been trying to get pregnant for almost a year