Conception is a metaphor?
Now I have a very abstract theory here, but I'm of the belief that just about every image and every line uttered in this film has deep symbolism and the attempted conception of Catherine by Jim is no exception. I may not describe this very well, but try keeping the theory in mind the next time you watch the film and it may make more sense.
Catherine is determined to have Jim's baby. The conception, in my mind, stands for love. We know that Catherine is completely inaffectionate and arrogant and that she is parctically unable to love a man. When she and Jim decide to have a baby, I think she begins to fall in love with him. It is interesting to note that the first time that the conception is revealed, Catherine and Jim are writing letters back and forth. Without being in each other's physical presence, Catherine longs for Jim and everything he stands for in her mind. If he were in her presence, she may very well decide to objectify him. When Jim decides that he will go back to visit the pregnant Catherine, the baby dies. She no longer longs for him and all traces of the love she felt are gone.
"The horror, the horror." - Colonel Kurtz, "Apocalypse Now"share