On July 20th, 2011,,,, I had unprotected sex 3 times, and he came inside me all three times. It was about 10 days after my period ended. Starting a week and a half ago, I've been tired, my breasts have gotten really sore and my lower back hurts a little. I've taken two pregnancy tests but they were both negative, and they were both taken before my missed period. I have the "I just know" feeling that i'm pregnant. I was just wondering what my chances of being pregnant were....... Can anybody answer this for me please?