Hi, I'm 23 years old and I was suppose to start my period on June 1 and today is the 8th and nothing came. I have never been late before except when I was pregnant years ago. I have never been on birth control so I'm wondering what other possible reasons could I be late for my period. I am not stressed and I don't have any symptons of being pregnant(at least not with my first child). I took two pregnancy test yesterday which came back negative. I have had sex at least one a week for the past 6 weeks. Could I be and not know it yet? When is a good time to take another P.T? Thank you.