Period or Implantation Bleeding

Ellie • Lauren Rozella-Mae 3.11.19 💖

I have officially psyched myself out and have no clue what I'm experiencing... My period is 4 days late. Last night when I wiped there was a small amount of light pink discharge. This morning it was light brown. Now it's getting darker brown and a bit heavier. I also had achy boobs this morning, which was my first symptom with my last pregnancy. Is this my period starting very slowly, or am I possibly pregnant?