Need some help..!

My period is 17 days late! And negative pregnancy test! I dont know what to think!!

01
    02/27/15
    my doctor told me sometimes it can be the littlest of things that can mess it up. Mine have always been irregular, even though I'm using birth control. Have you changed anything in your daily routine?
    0
      02/28/15
      Do you feel stressed? My OB says that contributes too. I had no period for 4 months!
      1
      02/28/15
      I went to my OB every month for 4 months! and my pregnancy tests came back negative. Stress does that and breastfeeding.
      0