Fertility friends has given me 3 different ovulation dates depending on chart. We arent tryig to get pregnant for another few months so I have been taking my temp last 5 months to prevent. Anyway FAM setting says cd 11, advanced says cd 13 and research says cd 17. Been crampy since cd 20. Still no period pretty regular with luteal phase between 13-15. Took a test on cd 11 or 12 cant remember. Anyway BFN. Which chart do I go with? Chart is attached. Thanks for any help?