Interesting - I wonder if your tummy was warmer than usual.
A friend once told me his mother reckoned when she was carrying him, a cat tried to curl up on her bump, he kicked, cat fled; he claims in jest that that explains why he was never a cat-lover!
Lol. I'm not sure but have heard cats should have the sense when we are pregnant, just like how they sense cat haters, and MUST convince them how gorgeous they are. :-)
Lovely! I doubt very much that cats can possibly know when a human is pregnant, and of course my friend would not have been a cat-hater pre-birth. His kicking was perhaps have been a reaction to the unfamiliar pressure, especially if puss had gone for the usual feline habit of going round in circles padding down the chosen spot to make it comfy.
I speak from some (though not all!) experience: GF's cat, bounding in from the wet lawn, leaping onto sofa arm thence onto Durdle's lap, pad-pad-pad-pad round-and-round and never mind treading on what as long as it makes a good bed, curling up and drying soggy fur by using my clothes as a blotter. While purring no doubt in approving of my bodily warmth and softness.