Brown spotting,late period

Hey ladies just in need of some advice. AF was due yesterday but two days ago I started spotting pink, I thought that my period was coming a day early but it stopped after about an hour. It started again yesterday I had some light pink and red spotting, so last night I figured I would put on a pad just in case. Well this morning I wake up to a little bit of Brown blood on the pad and I am still spotting Brown which is old blood. I usually only have that after a period. Has anyone else experienced this and turned out to be pregnant?