My cat is getting weird on me...Did this happen to you?

when I was prego with my first I had a cat that did all the same things. he was my baby I had him since he was a kitten. unfortunately he got really jealous of the baby. my cat would jump up and lay on her face whenever I left the room and he attacked her and scratched her. after a week I had to say bye bye kitty. I really hope this doesnt happen to you, but it could.