Should I take another pregnancy test?

I was 2 days late for AF... 2 negative first response tests then, then spotted/light flow of pink brown/ rust color streaks only when wiping for 3 days. No cramps or any other normal period symptoms, some bloating, but no drop in my breast milk supply like usual with my period. I'm 7months pp, and have had a normal cycle for the last 5 months. We weren't really tracking anything so my guess as to when AF should ahve showed up it's a guesstimate based on my last cycle.