brown discharge ?

Kristina
Okay so this past month I was 3 days late. AF was suppose to come the 15 and came the 18th-22nd . 
A few days ago I was in the shower and had a bit of blood come out . Once I got out I wiped and had extremely light pink on paper. Literally went away right after . I just woke up from a nap and had brown stain on my panties! What is going on? Anyone ?!!!