hi, i am 24yrs old. height 165 and weight 50. my periods were due on 4/7/2011 i had unprotected sex on 1/7/2011. i'm sure that my bf ejaculate outside. usually my menstrual cycle is 28 days. i am expecting my periods on 4/7/2011 but it's already 1 week late. as late periods usually doesn't occur to me. the only change in my body is stomach bloated and tiredness. other than that, i do not feel any pain, cramps or vomiting. and i tried to take pregnancy test, it was negative. will i actually get pregnant? i am quite tensed, pls help me. thank you!!