Light brown discharge

Michelle • Married 10/30/20 & trying for 👶🏼 number 1!

Light brown discharge when checking cervical mucus 10 DPO. I also have mild cramping in my pelvic area for the last 2 days. My period is due on Sunday, today is Wednesday. Just start of my period or maybe implantation? I took a pregnancy test yesterday and it was negative.