If you are engaging in sexual activities and sperm enters the vagina then yes you can get pregnant. There does not need to be penetration. But, your friend is most likely not pregnant. There are TONS of explanations for every single symptom of pregnancy other than being pregnant.
Yes! Those little sperm guys are wriggly and cagey too! Sticky fingers, spitter or swallower - lots of possibilities! Turkey baster too!
Or some other guy!