Can stress cause you to have little to no cervical mucus?

    I've been stressing out a lot lately...mainly because I'm four days late on a period (however it was that late my last period too) and finals week is coming up. 
   I just had sex for the first time about two weeks ago and I bled a lot. I also have little to no cervical mucus. 
   Is stress causing me to be late on my period and have no cervical mucus? 
    Am I pregnant? Or is it something else?