Unwanted pregnancy this way?

Unwanted pregnancy this way? help me im paranoid? is there a chance that my sister can get pregnant? like if i masturbated in the bathroom and after that she went to the bathroom to take a bath or washed her vagina or masturbate too or the water that she used has a spilled semen? and what if she does and her hands contained a spilled semen? or something like that? and she touched her vagina or masturbate too? please help me. im so paranoid. i cant even concentrate in school. im always depress and tired. i hope you guys can help me and she became a little fat i hope you guys can help me. im so paranoid and depress im a good boy dont drink dont smoke still virgin. im depress but masturbate a lot