Worried

Hello ladies, so I know this is a strange / weird question and I know I sound so uneducated, but I had sex with a guy today, and he wore a condom but he rubbed against me without one on, I told him to put one on immediately and we proceeded to have sex... He came inside the condom that was inside of me, I'm just worried incase I'm pregnant because I've been feeling sick and lightheaded... This sounds way weird but please can someone help me out? Thanks