PLEASE HELP

This is gonna sound kinda dumb but I am freaking out and need some opinions. A little over a week  ago my boyfriend and I had sex for the first time. Although, the only thing that happened was he stuck it in and out twice and that was it. No precum or ejaculation. My period is late and I'm afraid I'm pregnant. I just want to know what my chances are and what you all think? Maybe similar experiences? Please help!