Do you think pets have a 6th sense about pregnancy?

Maybe I'm just crazy, but I'm 10dpo and my dog follows me literally everywhere. Even if he doesn't go into the room that I go into, he will stand by the door like he's my body guard or something. It's super cute and sweet, but I'm wondering if he can sense that I may be pregnant? I don't know for sure that I am or not yet, but it's got me wondering... What do y'all think?? Am I just a nut case?! Lol.