No, you cannot get pregnant if it only touches the lips. This is because pregnancy occurs when sperm reaches and fertilizes an egg in a woman's body. For that to happen, sperm must enter through the vagina and travel up into the uterus. If a man ejaculates near or on the vulva (the opening of the vagina) without entering it, there is still a very low chance of getting pregnant as some semen may be able to make its way inside in rare cases. However, touching someone’s lips with your own does not cause sperm to be present or introduced into the body so no matter how much contact there was between mouths, you will not become pregnant from this alone.