been feelin sick when ever i get tired am i pregnant?

i had my period which lasted 4days which is normal then 2 days later i had a pinky colour discharge like a period just alot lighter in colour which lasted 2 days then agen 2 days later the same....i took a hpt but came negative i am now due for my normal pirod but insted i have a thick white discharge what does this mean?? i also have been feelin sick when ever i get tired which is very easly latly