Omg I'm freaking out

Okay so me and my boyfriend had sex abt a week or 2 ago and it was without a condom but he didn't cum. so I should be getting my period the 13 and I've been getting Brown discharge a little before I had sex and now it's happening again, I'm literally terrified. is this a sign of pregnancy? can I get pregnant w out the cum? what's all the Brown discharge?? SOMEBODY PLEASE HELP