(PLS READ) 5 days late

last time i had my period was jan 17- jan 21 , my cycle is i believe 35 days and it says i’m 5 days late to have my period. i had protected sex a week ago (didn’t cum in the condom or anything, finished him off myself) and that was all. i haven’t had any cramps or headaches or sore breasts, all month i just haven’t had any sign that i usually would get when i get my period. should i be worried? i have been pretty stressed the past few days so could that be a cause? please let me know i’m honestly starting to get worried because i never remember my period being irregular