last weekend i had unprotected sex (so 7 days ago). now i feel sick to my stomach, i had tender breasts a few days after intercourse, and some cramping. i don't know if it is because of my period (which is due anytime between the 1st and the 15th) or because of stress because my grandma passed away on tuesday, or if it's because i'm pregnant. today i'm going to the doctor's to get a blood pregnancy test, but is it too early to tell? what are the odds that i am pregnant?