I never really wanted kids (having worked in a daycare for 4 yrs... man was THAT rough!) and I certainly didn't plan on it. Since it'd be high risk due to Epilepsy and there could be some bad outcomes, I was against it.
Then I accidentally became pregnant... and after crying & panicking, I picked myself up and found myself looking forward to it. Pregnancy and childbirth for me was something I can look back on with pride and feel mighty thankful for.
I only have one child, and will not be having any more, for several reasons. I have always had pets, however, and will add to my brood when the time comes... a stray cat here, someone discarding a dog there.
Anyone who chastises another human being for not doing as the Joneses do and procreating and having 2.5 kids with the picket fence and all that crud, needs to shut their holes. It's a personal preference to NOT have children, just as for some people, it's a personal preference to have as big a family as they can afford. I like to see big families and understand why women have back-to-back babies, just as I totally understand only-child households like mine. And I expect people to understand MY choice for only having one child. Just as people should respect YOU for not having any children.
Anyway, pregnancy certainly swings your view a certain way, if it happens when you least expect it or in my case, totally did not want it. But the best & sweetest surprise is what I felt when I first laid eyes on my daughter, and what I feel each night when I kiss her nighty-night. I guess you don't know how 'good' you are going to be at something until you actually dive into it... like, parenthood.
And as far as being SO enamored of your cats that you don't want human children? That was me, 9 yrs ago. And now, I'm the type of mother that when I'm in the grocery store, if I buy a treat or toy for my daughter, I also buy little furry mice or some treats for my cats. My cats do not get shafted in my house just cuz I have a child. And they know it. They're very much loved!