PLAN B AND SPOTTING 😞

So I took a plan b pill in July during my fertile week. Took it within 48 hours of unprotected sex. Cum in me and all. Anyway my period was supposed to come Monday but instead u had this weird light pink spotting 2 days before. Barely anything. Lasted for 2 days with the pink and then brown spotting. Nothing heavy at all. Just a drop here and there. Usually my periods are full blown. Think there's a chance I'm pregnant or am I just freaking out?