what are the posibilities of a girl pregnant with precum if you have done un protected sex?
Precum contains about 1/2 the amount of sperm as the main load. The odds are the same though as full intercourse with a full load. Sorry to tell you this but it only takes one sperm. The main factor is what stage of ovalation you are in.
Precum doesn't contain much if any sperm. It is far less likely to get pregnant from precum without a full ejaculation. It does depend also on what part of the cycle the girl is at.