Highly unlikely; what few sperm there is in pre-ejaculate most likely died in that time frame.
And become an advocate of hand washing... Fewer infections... Fewer pregnancies
yes.. there is always the possibility that the precum entered the vagina and thus causing her to be pregnant.. but then again sperm can only live in the air for a short while.. go online and investigate sperm.. tell her to take a pregnancy test 4 days before her period is suppose to come or a week after its suppose to come