Could pre ejaculate cause pregnancy?

Yes it can: Because it can cotain live ; active sperm which can result in a conception ; thus pregnancy. This is prime reason for withdrawal prior ro percieved ejaculation is not a safe method of concreption.

Yes: Most studies have shown low levels of sperm or no sperm in pre-ejaculate with sperm not being motile. One small study published in 2011 showed that there are some individuals with a high motile sperm count in pre-ejaculate. See: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564677/ Pre-ejaculate