I had a drop of pre ejaculatory liquid on my hands. after wiping it off on my clothes i inserted my hand to a womans vagina. can she get pregnant?

Pregnancy unlikely: Many things "can" happen in life, but dried stuff on one's hands won't start a pregnancy. Washed hands won't start a pregnancy, with or without soap. If not married, settled down, and wanting to start a family, a couple should use reliable methods of birth control all the time. That is because today's pre-ejaculate leads to tomorrow's ejaculate. Life is that way.