Discharge & late periods & headaches

My period has been late for the last week & a half I have not had any type of sexual interactions & I know It’s common for me to just miss my period but I am starting to have a bad smell which is so embarrassing & when I go to wipe myself it’s of a brownish color I tried looking it up but it gave me so many different idea’s what it could be, I really need someone to help me ! Please