You could be, you never know and yes brown blood is common around time of your period. Since your period is due take a HPT! Your symptoms could be pregnancy or even AF coming but late.
HI ALL PREGNANCYS ARE DIFFERENT. I HAVE 3 CHILDREN AND ALL THE PREGNANCYS WERE DIFFERENT. THERE IS A HIGH CHANCE OF PREGNANCY AND IT COULD DEFINATLY BE IMPLANTATION BLEEDING. I WOULD TAKE A PREGNANCY TEST TO PUT YOUR MIND AT REST. IF ITS NEGATIVE MAYBE ITS THE START OF YOUR PERIOD. IF YOU STILL DONT GET YOUR PERIOD THOUGH I WOULD TAKE ANOTHER PREGNANCY TEST . I HOPE THIS HAS HELPED YOU. LET ME KNOW THE OUTCOME, ALL THE BEST TO YOU.X