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
And become an advocate of hand washing... Fewer infections... Fewer pregnancies
Highly unlikely; what few sperm there is in pre-ejaculate most likely died in that time frame.