Jealous Pets

So I'm 5 weeks along and I'm feeling it a bit. My cats however are less than pleased. Before I would let them sleep on my tummy at night. Who ever gets there first, I'm not big enough for two full grown cats on my tummy. Here resently though I've been kicking them out of thier spot as its become uncomfortable for me to have them up there. Needless to say they are less than pleased with this and have started to love on my fiancé more amd every now and then look at me to see that I've seen them. I find it funny that they chose to react this way. Fiancé is less than pleased. He doesn't necessarily dislike the cats, but he's not fond of them. Anyone else's pets react to the house changes in funny ways?