No one gets pregnant from water tubs or pools. Really, it's not THAT easy to get pregnant. Sperm is smart and all but does not find a vagina while floating in a pool and swim there. :>) No, you can't get pregnant from washing your vagina in the public bathroom. However, really, I can't imagine needing to masturbate so badly I do it in a gross public place. Wait til you get home and let the next person use the bathroom to pee rather than tying it up for that.