QuickCheck: Can dogs sense pregnancy in humans?

Is true that dogs can sense whether their human is pregnant or not?

IF YOU'VE spent any time scrolling through animal videos on social media, you've probably come across at least one heartwarming clip of a dog refusing to leave their pregnant owner's side, sparking a temporary touch of baby fever.

It makes you wonder: are these pups just being extra clingy, or can they actually sense that their human is growing a child?