plan b early and late period

Aylin

so i took a plan b october 8th and got my period very early on october 10th, my last period before that ended september 27th. Now according to my clue app my period is 5 days late and i was supposed to get it around the 10th of this month. i usually get it somewhere around the 20th-27th of each month. is this plan b messing with my cycle or could i be pregnant? ive been sexually active recently and im freaking out.