Tmi but I need your help!!!

So I'm on cd 54 and I thought I started my period this afternoon after going to the restroom (finding pink blood on the tissue) so naturally I use a tampon because I'm assuming I'm starting my period but since I got home I put on a panty liner since my tampon was pretty much dry with a little bit of brown blood on it....  
Has anyone had this happen to them? And what was the outcome? Thank you so much!