Do toddlers "just know" you are about to go into labor?

I'm 39 weeks today and my toddler has gotten some sort of wild streak into her today. She's throwing tantrums, smacking me and then getting super clingy and wanting to lay all over me and hug me. All this that normally aren't her... she's usually so laid back and independent and the smacking is totally new. Idk what to make of it but I swear I'm loosing my mind. I feel so tired today, and as if baby is never going to come. Anyone think toddlers can feel the the changes coming?