The wants could also be ironic. As in nobody wants to get pregnant. When would be the worst possible time for Snow to find out she pregnant? When she’s in Neverland.
It would be ironic if Snow were already pregnant from having sex with David in SB. Yet, then to find out Snow is with child in NL would be really poor timing from her perspective since she has enough to worry about right now. Having to worry about her unborn child while she has no permanent shelter, little food and is being hunted by PP and his minions would be horrible for a pregnant woman. I still think the key word here is that a main characters WANTS to get pregnant, and I don’t think Snow wants that while she’s trying to save Henry in a hostile environment. I do think Snow will want a child eventually, but only after she, David, Emma and Henry are safely back in SB or in the EF one day.
Also, the thought occurred to me that since time is frozen in Neverland like it was during the curse that none of the women could get pregnant even if they wanted to. But again, why would anyone WANT to get pregnant whiles stuck in NL? It’s a hostile and dangerous place and their focus is on rescuing Henry.
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy