Funny you mention that episode of TNG, I was deciding which TNG to watch earlier while eating and I saw I was almost up to that ep, and I thought... mm, not that one. And not while I'm eating. Haha.
As someone who was pregnant, for a short time, due to... well, an unfortunate accident with a precautionary measure (yeah, protection... not always effective; not to mention I was born to my mother while she was on the pill) I can say that that "rejecting with every fiber of my being" feeling is very real.
I think I can say it ranks up there with the most terrifying moments of my life to realize there is something inside me that is going to do its thing, and there is nothing I myself can do about it. I have no control and this thing is going to take control of my body, and my life. This wasn't the reason I did not become a parent - I did think long and hard about it, and I believe I made the right decision not to - but I am more terrified of pregnancy than just about anything else. There's something fundamentally incompatible with it and with myself. In fact, for the short time I was pregnant, I fast became very ill. There were no diagnoses for the illness, but I felt it was just the situation in itself, and stress it was creating. Physical and mentally it crippled me and I decided to do what I had to do. I honestly contemplated all kinds of things that would **** me up enough to cause the pregnancy to fail, I was in so much terror of it. In the end, having a TOP was a breeze compared to the things I would have done, had I not been able to get one. Oh yea, my mind was going to some dark, strange places at that time.
Really wouldn't advise it for anyone who is strongly adverse because the hormones, the stress and the fear is nasty. Not to mention the embarrassment. I'm not a female after all, having to hang around in endless rooms devoted to female/baby related things and have some guy shove his fingers up there... oh boy. I don't regret that decision and I never will. I was never meant to have been in that situation, as far as my mental wiring goes.
I equate childbirth with things I'd see in a Giger painting. Some creepy-ass biomechanical parasitoid machine inside a dead woman waiting to be fired out, or something. Maybe not quite that bad for other people, but being pregnant is the stuff of my nightmares.