Do you think your pets know you're pregnant/when you've conceived?

There are no definitive studies out there, and opinions just don't help, since everyone thinks differently or sees different things. We have a 5yo dog, and I think he at least suspects, but my hubby isn't so sure.
There are some who swear dogs (and other small children even!) know. My friend had a cat who she said knew she was pregnant.
I'd just like to see what everyone else's experiences on the subject were.

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