I CANT BE PREGNANT 😭

I had my period 2 weeks ago I am ovulating now! I have a brownish red discharge, slightly cramping and bloated. I was nauseated all last week, and my back hurts! I had sex (no condom) with this guy about 3 weeks ago had my period and now this! I've also had sex with two other guys but took plan B after! PLEASE SOMEONE HELP!