Perhaps you heard of how your pets (and other people’s cats especially) sometimes gravitate towards you when pregnant.
I have found that the stronger the bond between you and the animal the stronger their desire to:
a) claim you as their new cushy spot for some intense R&R,
b) claim the growing something they sense inside you as their own,
c) follow you everywhere – presumably that you don’t make off with their young,
d) they get fat right along with you
e) get as close as possible to your belly as they seem to like getting kicked around .