I am 39 years old. Had my tubes tied over 14 years ago. Have always had very regular periods. All of a sudden, I am over a week late. I felt like I was going to start my period when it was time for it to start, but now all of those symptoms are gone. I have taken a home pregnancy test (two times), but both tests are negative. I have no signs of pregnancy except a sudden missed period. Is this age related or could I be pregnant?