the pregnancy risk is very small. but not "zero". while i commend your attempts to limit your sexual activity to mutual masturbation you have a responsibility to keep viable semen away. far away. from your female partner's genital area.
could my girlfriend get pregnant if the small amount of semen i had on my hand made contact with the vulva? . me an my girlfriend were performing manual sex and as we are youngish we have decided this is all we would do she performed a handjob on me and i cummed and then about 3 minutes after i rubbed her clitorus and vulva with my hand which (from what i remember) contained a slight bit of semen do i have a risk of pregnancy? she was not on her period or in the stages of ovulation.