Is it possible to get pregnant when he ejaculated on the vagina and a little on the inner leg?

Depends on where: A fertile woman can get pregnant if she touches fertile semen to the inside of her vagina. With semen only outside the vagina, the answer would generally be NO... but of course, life can surprise you sometimes. (Note that not all semen is fertile. Semen from a guy who has had a vasectomy looks the same as fertile semen, but has no sperm in it.)