Brown Discharge

I'm due on my period this weekend (Glow says Friday but it's a day out normally). But this morning I have had a light brown discharge. But it's stopped now. I am TTC - took a pregnancy test yesterday as Glow said to (not pregnant) but I probably did it too early anyway as I say - Glow & my body are a day out of sync! Anyone else had this? Could it mean anything?
Thank you