I am a week late. I took two pregnancy tests about two days ago- both negative. I thought I started my period today during work. I had bad back pain and was emotional, which are my typical period symptoms. However, I just realized a little while ago that I haven t changed my tampon since work. So I went to see if everything was okay. There wasn t a lot of blood, but there was brown discharge on the top of the tampon. What does this mean?