Period stress 😫 help!

I am supposed to start my period today...I still haven't started and the last three months I've started on the exact same day not late or anything. I've had sex this month, protected for the not part but two times the condom broke in the middle of sex but he pulled out right away. Last week my boobs were sore, and today I've only had a little bit of cramps but my lower back is bothering me a little bit...does this mean anything & should I be stressing? 😔