I touched someone's hand to pass them something at a party, and if a few minutes after doing so, i rearranged my underwear (since i had uncomfortable shorts on) is there a possibility of pregnancy? i didn't stick my fingers in or anything weird?

Sperm are too fragile to survive outside their favored environment of the vagina for more than a few minutes. They don't have a system of independent movement through the air and dry environment you cite. I wouldn't worry about it.

No risk of pregnancy. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines