My boyfriend & I had unprotected sex (November 28th 2015) two days after my period ended to which he did ejaculate. Now I am experiencing fatigue, & a knot like pain in my left upper back (by shoulder) & chest pain on my left side. Also, eating to MUCH! Craving sweets all the time & cramps are uncomfortable (not due for AF until (12/20/15))could I be pregnant ?