Ladies? Any insights here?

Juli • Ttc #1 since June 2015. Laparoscopy to remove endo in July 2016. After 6 failed IUIs, we are starting ivf in April 2017!
Ok so I'm 15dpo today and my temps are still waaaayyyyy above my normal post-o temps... But bfn this morning. My two open circles at cd13&14 were 50 minutes later than I normally temp. My usual post-o temps are typically in the 98-98.20s range. These are unbelievably high after that dip at 9dpo! And I usually drop at 12dpo. Is it possible I'm just not getting a positive yet?? Ugh! Temping is stressful lol