Losing my Virginity... Worried

I'm 17 years old and I had sex with my boyfriend yesterday for the first time. He didn't wear a condom and said he didn't come in me at all, from what I felt and saw. I just am worried since it is my first time and I have the worst luck in the world that I somehow got pregnant. it's only been a day so maybe I am over analyzing it. What are your opinions. Please let me know! Thanks! -C