My girlfriend and I both believe that we should be abstinent until we are at least 18.
However, we were fooling around the other day and I began to go inside her. Just a single time, and I hadn't ejaculated yet. I don't know if there was any pre-cum or not, but if so there couldn't have been more than a drop, and it had less than a second or two in contact with her.
Yet I'm wondering. Is it possible she could get pregnant? If so, is it likely or not so much?