what's going on?

Ch
I'm so confused. It's 16dpo, pregnancy tests are negative, weird spotting and cramping but no af. 
Once your temp drops, it's over, right? But then the app reset my cover line today, so now it's showing it hasn't even fallen below the cover line, though it kind of has if you see where it would be if the pre-ovulation dip wasn't there. 
Any thoughts welcome, please and thank you. I'm so tired of waiting, this is driving me to 😢