Serious question

Brittany ☃❤️✝ • Mommy to 2 Little Angels ❤️🍼
For the past week my boobs have been hurting and I have been feeling sick plus, my nipples has change to a brown color and that my boobs have gotten bigger but, I have knots in my boobs ( I know it's not breast cancer ) what could it be?!? I took a test and i threw it away but a couple minutes later I went back and it showed a faint line I don't know if I'm pregnant or not.