Spotting?

Ok so I'm not on my period infact I missed it I am not sexually active so I know I'm not pregnant but I don't know what the hell is in my underwear like I thought I got my period beacuse I can feel it when I do have it I have had cramps mood swings headaches and my other normal stuff for when I do but I thing this might be like spotting maybe. HELP PEOPLE WTF IS IN MY PANNTIES