Late period

I know I'm probably fine but I just need reassurance. My period is 5 days late and I still don't have it but it's the end of my first semester in college AND my relationship with my boyfriend of 5 and a half years ended a week ago so I've been hella emotional and stressed lately. My (now ex) boyfriend never came in me, he always wore a condom and pulled out. It's late because of stress right? There's no way I could be pregnant