Pains in the stomache with cramping and diarrhea

My bf and I had unprotected sex on the 9th and the 11th and he ejaculated inside of me....I want to have a baby and i have symptoms I think. Im due for my period tomorrow i think. the 10th was my most fertile day so its possible. My breasts hurt, i was a little bit nauseous, and I am soooooooo tired lately....i hope its not a period thing, I want to be pregnant...I am 19 and able to care for a baby with my bf...do you think i'm pregnant?