I had sex November 29. On December 2, I got my period which lasted a whole 7 days. On January 2, 2014 I was suppose to start my period. I am now 7 days late. I have nausea, headaches, fatigue...I can barely open a bottle of drink. I am cramping, and I have lower back pains and when I brush my teeth, my gums bleed. I know my chances of being pregnant or low, but is it still possible that I could be pregnant?