HELP! HAVING SYMPTOMS BUT SPOTTING

Morgan
Okay sooooo tomorrow is when I'm supposed to take a pregnancy test because my tww ends then. I started to spot on Tuesday and it was brown but not too much. Thursday was the only day that it was red, and gone by that night. Is that my period? Then today I've have weird symptoms: nauseous, gasey, going to the bathroom a lot, and my nipples hurting. 
WHAT DOES THIS MEAN? 
Just a weird day? Period? Take a test?