Pregnant

I am 5 days late on my period and idk if its because I have stressed out really bad i have had so many life changes from moving into my new apartment, getting a new job, getting a new car , and quitting the new job and going back to the old one. Me and my so had unprotected sex one night and he did not pull out unfortunately. I didn’t take a plan b because I only had a 3% risk of pregnancy. Could I be pregnant? I have gone through so much changes and I have been stressed out