confused period

so my period is about 5 days late , 100% i havent had sex during like a firtle window or anything like that & the last time i had sex we used a condom, but it was so long ago i dont even remember when it was .

this is the first period im supposed to have since school started back up and i started a new job & im feeling the back pains that i usually feel & a couple cramps here and there but im alarmed that it hasnt started & if its due to stress then how long would it be delayed for ? like im just confused