You're not a horrible, selfish person, and good on you for taking the stress-free route.
My mother (who is pretty terrible) said something about wanting to be in the delivery room and I think my visceral reaction was a big reason why she suddenly backpedaled to "I mean, I'll take care of (my toddler) until you come home from the hospital!" My partner wanted to explain but I told him no, she'll just have something else to drama queen moan about to her friends and extended family about her ungrateful daughter and while I don't care what she says, I also don't need the added stress of her whinging.
Enjoy the last few weeks as much as you can (I know the difficulties of a hard pregnancy) and rant away (it does feel better, doesn't it? I composed a freaking novel's worth of emails on nights when I couldn't sleep, thank goodness for the draft box and always addressing it to myself!).