Whats the possibilty of being pregnant through fingring but not a lot of semen?

Rare: Though semen could enter the vagina via a finger, this would be an unlikely way a woman would get pregnant. If you're concerned about pregnancy, consider using reliable birth control. Otherwise, talk to your partner about what you feel comfortable with and not comfortable with, so that in the event that you became pregnant, you would be on the same page. Don't feel forced to do anything.