Late period brown dishcharge

So my period was a week late this month which is very rare for me I had what I thought was spotting Jan 3-5 I stopped my period was due 8 days ago and now I am just having dark brown discharge I'm so scared I only see the discharge on a tampon or when I wipe it's just like greyish... . I'm anxious I need answers!! I'm also very light headed and shaky boobs are also starting to get tender I just feel like crying right about now.