Can my dog tell

Can my dog "tell" If I'm pregnant? I don't know for sure that I am, and I doubt that I am (I wish though) but my AF is due on the 3rd or 4th and tonight my dog has been EXTREMELY lovey, wanting to cuddle more so than usual (she IS a cuddler to begin with) and won't leave my stomach alone...I know it could be a million other things as to why she's acting this way lol I'm just curious, could this MAYBE be a possibility?!