Well, they're unhelpful because replies of "we just knew" imply there was no forethought, it was a forgone conclusion. I've never had anything in my life be a forgone conclusion. Everything I was told, "you'll just know" about hasn't been that way.
I also, to be 100% honest, I can't imagine not having concerns going in. Regardless of the social expectation that everyone is a great parent, as a teacher I can tell you that just isn't true. I've seen a lot of examples of average parents and many examples of parents who should have been sterilized at birth. That sounds harsh, but it's true. There's a very heavy evolutionary pressure to have kids and I've heard some very silly reasons to have them. (Example: I thought it would save my failing relationship.)
I'm at a point right now where I'm examining my own motives. I have no deep need to have a child. No biological clock is ticking for me. But my husband and I are talking about it and thinking it though. We're asking
why we are thinking about it and what those thoughts mean. In an effort to get a different perspective, I thought I'd put the question out there. The comments on this thread will
not make me decide to procreate, but I hope they will provide a starting point for further conversations with my husband, to help us look at things we my not have otherwise considered. So with that end in mind, "we just knew" doesn't help.
Thanks to everyone who replied, though. It's interesting to see everyone's thoughts.