Faint line 13dpo? Lines not getting darker?..

Has anyone with a successful pregnancy had this faint of a line at 13dpo? It was pretty similar yesterday at 12dpo (not FMU) but was slightly darker on a FRER.. I also took a digital yesterday evening and came back negative.

ALSO, have been having brown spotting on/off since 11dpo PM (never happens before AF)

Here’s today’s test afternoon It’s really hard to see in photos but noticeable in person

This is yesterday’s First response .. again lot more clear in person