Spotting

Erin
Hi
​Two days after my AF ended I started having some brown spotting ... Only after I used the rest room and wiped.. Haven't got a positive on my opk yet and body temp chart is below.. 
​The spotting has lasted 5 days now and got a little heavier yesterday.. 
​My hubby has been out of town since last ovulation so I know I'm
​Not preggers.. 
​Has anyone had this happen before?