Is this it?

Misty
Whelp, I had some ultra light spotting this AM (CD27 out of 29/30). I'm talking like three little drops of pink on the TP. 
Nipples are stupidly sensitive, I can't even brush my fingers over them. Usually I like a good massage during PMS..not this time. Holy hell. 
Weirdest symptom is that I've had a fever and lower back pain for two days. 
FRER says BFN! What the..?