please help

so i’ve been on lo loestrin fe for two going on the months now and my last sexual experience was october 6th we didn’t have sex but he came on my ass and i believe it dripped down. a week or two later i found a pill that i must of now taken. now in present situation i didn’t really get a period. i had dark brown spotting, only a little bit, and that was it. should i be worried? (when i was suppose to have my period i experienced that spotting once, cramps, this burning feeling i get when i know i’m going to get it, my skin was breaking out, and i had back pain)