reply pls need more opinions

Hi everyone I'm due my withdrawal bleed tomorrow (3 days into the 7 day break) but today I'm getting a light pink spotting that's coming out with a bit of mucus, sometimes red, sometimes pink and sometimes a light brown, not very much, is this just spotting from my impending withdrawal bleed? Implantation bleeding crossed my mind and now I'm terrified, I have never missed a pill and I take them at the same time every single day, and only had unprotected sex once this month. Will someone please help me out???? UPDATE: no pink anymore just brown discharge