blah... what is my body doing?

J-lynn • 1 child on earth 💙 2 children in heaven 💖
I was due (based on this app) to start my period this past weekend. I never did so I took an 88 cent Walmart pregnancy test and it was negative. Now the past 
Yesterday I was leaking this brown... snot like consistent... stuff and today I'm not leaking it. Any ideas on what could be happening? I didn't do an opk this cycle.