Her ovulation was on 29 and i fingered her on 24 but i didnt release sperm but i wasn't sure if there was precum on my hand because i cleaned my hand with a towel before fingering her, what's the percentage of her getting pregnant?

Can't tell: Could be zero, but it's impossible to say that pregnancy is impossible. That means a couple needs to get on a reliable form of birth control, if wandering fingers are going to happen again... and fingers do tend to wander. If worried, one can do a home pregnancy test if there are early signs of pregnancy, such as a late or missed period.