Brown discharge for a week is it a sign of pregnancy ?

okay so i started bleeding a brown color discharge for a couple of days and i took a test which was negative and then last saturday i started bleeding a very light pink off and on could this be a sign of pregnancy also been very nauseous and tender breast and very emotional.

I’m 3 weeks late on my period. I had light brown discharge on the 28 or April and ever since I’ve just been having SOOOO much discharge. And it’s scary. When should I take a pregnancy test?