Can Stress Cause Delay In Menstruation?

Hi! I might be pregnant and won t have access to a test for a few days. I m six days late, but my boyfriend and I have only had sex twice. We used protection, it was about two/three weeks ago, and there were no breaks in the condoms. Also, I had final exams during my ovulation period and was incredibly stressed. Some people have said stress can delay a period. How likely do you think this is? Either way, of course, I will still get a test as soon as possible. I would just like a reasonable guess to calm my nerves.