The kill factor from hot chlorinated water would eliminate a great many almost immediately, leaving the water with a very low sperm count... something along the lines of a vasectomy (no, a snip job does not mean sperm-free ejaculate, learned that from a friend who had one), so the chances of impregnation would be very slim, unless a very big drop hits the water very close to the "tunnel of love"... still, be careful, I think OF has the right idea anyway... warn her that if she doesn't swallow, she could get knocked up

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