Winter - I am having a really similar experience to you!
I'm at 14 DPO, which is my usual luteal length, and by now in my cycle every month my temp has either dropped really drastically or spiked and then dropped. Right now I am just sitting firm at a nice high temp, which is getting me excited, but I did FRER yesterday and today in the morning and both BFN. I am so confused!!!
Trying next month will be difficult because we will be traveling and not really have any privacy. I would love for this to finally be the month!