We tend to think of the human womb as a weightless environment, but it appears from some preliminary work that the tug of gravity is quite important for stem cell development, and by design, fetal development -- to the point that unless a lot more research is done to determine it's not a problem, the intrepid "first couple" in space in the intercourse sense had better have protection. Now, seriously, if they were so lucky as to get both lucky and knocked-up in space, I suspect that they wouldn't be in orbit long enough to affect the development of the space-conceived tyke.
So I doubt this interesting research has any serious long-term implications, at least for the foreseeable future and probably for longer than I'm boing, er, going to be alive.
Embryonic Idea: Human Procreation In Space Would Be Perilous