Very faint line - help reading my test

I am usually consistent with my period and have a 25 day cycle each month. So, I was surprised to be in my 28th day and still not bleeding. Yesterday, I had some light (I mean REALLY light) spotting that was dark brown. It didn’t even fill a panty liner. This morning I have some very light bleeding that had more color, but there is no “flow”. This is what my test showed this morning 
is this just an evap line?