Brown spotting TMI

This may be gross and kind of TMI but my period has “lingered” i should say and I’ve had light brown spotting for the past 2 days. Do i mark this as part of my period if I’m keeping track since I’m TTC? It’s not heavy enough to wear a tampon but a pad. I feel like i have read in the past where this was a sign of too much estrogen. Anyone have any insight?