Kids and pets sensing pregnancy?

Ive heard of kids and pets sensing pregnancy whether the mom and dad to be knew they were pregnant or not.. did this happen to you? Im a believer in signs and ive gotten a few of those.. now our cat is being really affectionate more so to me then she normally is... did you ever experience this? I know, i know.. it sounds kind of crazy but its a real thing. Your body puts off a certain scent when youre pregnant that pets can pick up on, or so ive read...