How Long Does Semen Stay Active Outside The Human Body?

Well, i think this occured last week, i dont really remember, but one night i was in the shower & i was masturbating & for some reason when i was about to ejaculate i pointed my penis at the bar of soap i have in my shower & my cum went all over the bar. After that moment i realized that i had forgotten that i shared that bar of soap with my sister & i was so worried that i could possibly get her pregnant so i washed that bar of soap as well as i could, but my question is how long does semen stay alive after you ejaculate? Is it possible she could get pregnant? Im very worried, Im only 15