most helpful answer that would be highly highly unlikely. sperm are tricky but it would be one magic sperm that could jump out of a toilet hit your vulva and someone make it up the vagina into the uterus and up the fallopian tubes. i would say the chance of pregnancy occurring in this manner would be nearly impossible.
if guy ejaculates on toilet then min later girl goes to restroom and water splashes on her vulva can she get pregnant?