I masturbated n whipped everything off, few hours later i stuck my penis in my gf's vagina once all the way in then pulled it out could she be pregnant?

Maybe: If you did not ejaculate inside her, pregnancy is unlikely. Part of being a young man is doing wild fun things like this, and i'm glad you're also thinking about the long-term consequences. Until you're sure you want to be a dad, use barrier protection from now on. And treasure this time in your life for its many new joys and responsibilities.

Protection : Whenever having unprotected sex there is always a chance of pregnancy regardless of climaxing during inter course. In this day and age and the prevalence of stds everyone should practice safe sex practices by using barrier protection ie condoms (male or female). Regardless of your commitment to one another i would strongly advise always stay protected.