Long luteal phase...

K
My cycles are pretty irregular & range anywhere from 26 days to 37 days. Ovulation occurs anywhere from day 14 to day 25.  My luteal phase usually lasts 11-13 days. Last month, my luteal phase lasted 24 days; this month, I'm already 15dpo with one bfn that I just received two days ago. Does anyone else have this problem?