Watery period??

My period was suppose to start on the 20th. i showed nothing beside white creamy discharge. on the 21st later in the day i went to the restroom and had some pink spotting, i put a pad on and when about my day.. then a few hours later went again... pink still.. well before i went to bed i peed again, the pink turned into bright red. all day ive been peeing and on my pad is brown but its super super light. but when i wiped i get blood again light to medium. the last few times tho its been really watery red. what could this mean? has anyone have had this before?