Children sensing your pregnant

Has anybody had their children sense they were pregnant before they found out? Before I found out I was pregnant with my second my daughter(1 at the time) started becoming more clingy and rubbing my belly and sure enough a week later I got a positive test. A couple days ago my daughter(3) put a sticker on my belly and told me she was putting a baby boy in my belly. Haven't tested yet as I'm not due for another week