can pets tell if your pregnant before you know?

Angel

cause my cat normally she will come love on you for a few seconds then leave she NEVER sleeps with me but lately she's been laying on me more coming and sitting on my belly and chest and tonight she is laying on my chest while I'm in bed. I'm 3 days late for af but I didn't realize that till today is it possible her change in behavior could be her way of telling me???