pregnancy from bath tub?

[punkincrublic]

My girlfriend and me were in the bathtub a weekish ago and i was worried that there is a slim chance of her getting pregnant from my pre-cum in the water.
is this a reasonable concern?
if it counts for anything, we made love afterwards and we used spermicide foam.
should I be worried?
(she got her period today, I'm just curious for the future)

[demonbuttercup]

Pregnancy FAQs and Myths

[Brandye]

Not going to happen if your penis is not in her.