if I have a little bit of sperm on my finger and finger my girl but not go that deep with she get pregnant?
It certainly is possible.
Pre-ejaculatory fluid (pre-cum) contains sperm. And research has confirm this—it could get her pregnant.
A UK study found that a third of men produced sperm before ejaculating—and with the exception of 4 out of 17 cases, all of the sperm were mobile and lively.