Is it possible to get my girlfriend pregnant from pre cum? I know I didn't ejaculate inside of her but she is also now two days late on her period.

Pregnant??? Unfortunately the short answer is maybe. Preejaculste fluid may contain viable sperm. It's main function is to cleanse the urethra and make the vagina more receptive to sperm. But it may contain low levels of sperm and since it only takes 1. I would suggest your gf take a pregnancy test in several days to be sure. If she's not pregnant I suggest using a condom next time. Good luck.