Hi i'm 21 years old, i've been in texas about a month, and i just came back february 23. I've been home for about a month, me and my boyfriend of eighjt years has had unprotected sex, march 2, 2007. I was expecting my period on, March 4th, and it still hasn't came. I've taken an home pregnancy test, and it came up negative, and I've also went to the emergency room for abdomenial pains, an another test and that came up negative also. My cycle just changed in January. So what's the problem?