My girlfriend and I were in the shower. I had shorts on and she had bra and thongs on. We made sure my penis was away from her vagina during the whole shower. At the end of the shower however we both sat down in the lukewarm/hot water together. Mainly she was resting her head on my chest so my penis was still far away. I am wondering if I ejaculated, is it possible for it travel in the water all the way into her vagina? We are both 17.

Possible but highly unlikely

No, she cannot get pregnant in this manner as the sperm would die the minute it hits the water.