What is going on?

Christina • Wife, pharmacist, mother 1 daughter, 2 dog daughters and 1 cat 😊
Im on CD12... By now my temps r normally back to pre-o temps 97.2s-97.3s. My temps are still up. 97.5s-97.9s. Today I had spotting, just once, dark brown, that I noticed after wiping. The past week after my period i have had veryyyy mild cramps. (I had my period tho and it was 4 days followed by a couple days w/ just some spotting and it didn't seem abnormal).I took a pregnancy test on CD3 because my temps were staying high (vs dropping back down to pre-o levels w/ only a few high erratic ones during the first phase like normal). BFN. Anyone have any explanation for this?? Or experience this?