Penatration and first time

Okay so this is completely out of my comfort zone but my boyfriend and I were playing around with each other, just exploring each other. I am the type of girl who wants to wait til sex to have marraige...well today my boyfriend stuck it in (barely even his whole head went it) and it really hurt and if he could have had pre- cum on his penis, could there be any possile way I would get pregnant? No he wasn't wearing a condom because we was not supposed to let that happen.