Pets and Pregnancy

So I'm just over 9 weeks (woohoo!), and I'm starting to notice that both of my cats seem to always be curling up on my tummy.

It's not unusual for my little maine coon to cuddle up on my stomach, but my tortie is super independent and normally only cuddles a couple times a week for no more than an hour. But lately she's been on my belly multiple times a day for hours. And neither of them leave my side for very long.

Anyway, my question..

Has anyone noticed that pets seem more friendly/needy/cuddly when you're pregnant?

Also, wouldn't 9 weeks be a little too early for them to notice anything different?