Can just a drop of precum not particularly drop just a touch of precum on finger and than fingering girl can make her pregnant .. although no ejaculation was involved ..just a tip of precum on finger?she did not take any pill.? is it matter to worry?

Possibilities...: It's possible, so the answer is not "no." That means the answer is "yes" but rarely happens. It is life telling a person 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.