Pregnancy wouldnt be possible at all from this.
Not possible. Semen (pre-ejaculation, or ejaculation) would need to come into contact with her vagina from your penis (even if it;s just inserted a tiny amount) for pregnancy to occur. What you did, it's not possible for pregnancy to happen as a result of that.
Maybe you guys should consider holding off on any more sexual related activities until you educate yourselves on the matter more.
id say very very slim also, though not impossible the odds would have it that she will not become pregnant
Very very very very very very very very slim.