I think about this from time to time. I was the last born in my family, with such an age gap between my siblings and I that I was raised as an only child. I've never met any of them. As far as where this fetish came from, I've been aware of it since I was 5 or 6. I actually herd from my mom that my father thought pregnant women were hot, so I wonder if it's genetic?
Having a family was something I planned on doing in the future, and I actually gave birth to a beautiful little boy almost 5 months ago (though, not planned, but hey). c: I have to say, the line between fantasy and reality is definately real.
I felt so incredibly unsexy. I never wanted to fool around with my fiance. I was so sore towards the end I could hardly move due to the weight of the baby resting on my pubic bone. My baby's kicks were so strong they hurt, and visibly moved my already stretched out tummy. And labor…I couldn't get that epidural fast enough.
A lot of the things I find sexy in pregnancy, like the big tummies that look like they're gonna pop, baby movements and birth are better left to fantasy, imo. Experiencing all of this, however, has not changed what I find attractive in my fetish. Masturbating to this stuff WHILE pregnant, though, looking back at it, felt kind of strange. In a funny way. I don't fantasize about myself being pregnant anymore.
TL;DR - It's all about the fantasy for me. Sorry if I drifted off topic. I've just never had the opportunity to discuss this before!