Different CM/discharge each day please help

Jahnia
Day 1 - a lot of watery discharge that soaked my underwear (along with mild stomach cramps , painful lower back cramps)
Day 2 - pinkish/brown discharge (along with mild cramps, mild back cramps) 
Day 3 - brown and white discharge 
Day 4 - nothing 
Day 5 - dark brown only when I check my CM and wipe 
Idk what's going on , anyone ever had this happen a week before AF is due ? Or know what this could possibly be ? Please comment