What am I doing wrong?!

This was Sunday afternoon. Have very very light brownish discharge since last Tuesday so 8 days today. I swear i see this vvfl so I figure by the next day it’ll get darker. Well I take a Walmart cheapie and nothing so I figure it’s just because it’s cheap so I took a FRER and clear blue and nothing. If I had a chemical wouldn’t I be bleeding? What can be going on? Btw this is a Walmart equate one.