Delayed or Missed Period

I had a little action with my SO about 3 days before my period (just oral and no pre cum went inside me), but we've also been traveling a lot recently and been super stressed about school and extracurriculars. I just started a job where I run a lot. I am now 6 days late on my period. I'm also starting to get wisdom teeth pains, so I've started worrying about that too. I had period symptoms around the time I was supposed to get my period... bad cramps, gas, and headaches. Am I pregnant? Could I just be worrying too much and once I relax it'll come? I'll take a test tomorrow to ease my mind, but what do I do?