missed period for 8 days

I haven't had sex since November 2016 and I have gotten my period regularly thought the months... but for some reason I am 8 days late this month... even though I haven't had sex I am still scared I am pregnant. I don't know why... this may seem silly to some and stuff but I have never missed my period for this long and it's freaking me out. This month has been pretty busy and stuff, I just got rejected my a scholarship and I am sad. I don't know if it is stess or not. But is there any possibility that I could be pregnant??? P.s- I have had a few cramps... and I always check my vagina with a mirror to see what's going on, and there is like while stuff coming out. Does that mean my period is coming? Thank you, please let me know if I am just psyching myself out for no reason.