Is Pregnancy Possible Without Any Ejaculation?

Hi. I was wondering. About 3 weeks ago I was with my friend and he put his penis inside of me for about 5 secs until I told him to take it out. There was no sperm on his penis, but I still would like to know if it's possible without taking a pregnancy test. I had my period and everything is fine, but my stomach has been acting different. I think it's because I am young and scared. Please help