A little bit of sperm touched the upper left side of my vagina lip. any chance of pregnancy ?

Well, There are two: Things that can lead to pregnancy - if sperm is deposited inside the vagina or if it is at the introitus (opening of the vagina). If your period is late would take a home pregnancy test.

Possible: Sperm in the area of the vagina could impregnate a woman. Sperm has been known to penetrate thin under wear. Obviously the closer to the vaginal opening the greater the chance of pregnancy.