It was mentioned rather prominently in a certain scene within the game, during which Jane and Marianne are told by Rachel and Jessica that Jane's semen is abnormally potent. Jane and Marianne realise that their previous bouts of unprotected sex may have resulted in a pregnancy, yet such was revealed not to be the case - this time. However, both Rachel and Jessica urge the young women that a greater degree of caution should be taken in the future.
Having said all that, I am all but certain that pregnancy shall at least be featured as a 'plot device' within the game in the future, even if not as a kind of fetish material. I could of course be incorrect in this inferrence, though given the 'evidence' - such as it were - available to us for now, I rather doubt it.
~Liz.