Teen pregnancy

i dont know if im pregnant there no signs so far but im scared i was having sex with my boyfriend and he cummed but he pulled out he did cum on the opening of my vagina i stuck my finger on the top since he cummed towards the bottom and pushed it out that was our first time using without a condom and now im scared i dont know what to do and i know for sure i dont want a baby bc i have plans for my future we agreed to stop having sex until further notice but does anyone know how to automatically tell