What are the chances of pre-ejaculate to get a girl pregnant?

That is possible, the pre-cum has some spermatozoa in it also.the chances are most likely the same as when one has sexual intercourse,vaginally,without using a condom about 1 in 170.

Thats the statistical figures but my first intercourse without a condom resulted in pregnancy the first time I enjoyed sexual intercourse without a condom so one should not take risks if they did not want a pregnancy,I did,so it didn't matter.

The sexual excitement which causes the semen to come out of the penis before the orgasm and regular ejaculation contains sperm as well in the semen,so if you do not want a pregnancy or STD,always use a codom and not an animal skin kind,as they do not provide protection from pregnancy.