I'm 24, my period was due on 10/18/2007, I don't have many pregnancy symptoms, I was nausious today, and a couple days ago, I had butterfly's also. My breasts felt tender last night but fine today. Today I am having mild cramping, but no sign of period coming. Me and my boyfriend have had unprotected sex, (withdrawal method). Could I be pregnant? I have a normal 28 day cycle. Please help!