Confused

Sara
Okay so I'm on cd40 17dpo no period have had cramps here and there mainly in just my right ovary. Usually get cramps in my back before my period. My bbt is high my cm is very creamy and cervix so high that I almost can't touch it but took cheap .88 test from Walmart and it's negative. What is going on with my body. Could the cheap test just not be picking it up.