Do animals know if your pregnant?

I’m a nanny and I’ve been working for this family for 3 months well the dog is around me but never glued to me.

My AF is suppose to be Christmas well today this dog has been laying on me and my stomach the whole time. When I was sleep and when just sitting in the couch

The photo is me sitting on the couch and the dog laying on my stomach. If I get up and sit down he is back on me or he gets up but comes and lays right on my stomach.

I feel like I’m going crazy 😂