Can my dog tell I'm pregnant?

Megan
My husband has had our 1/2 Great Dane 1/2 Cane Corso 7year old male since he was born (he had his mom) so he is very intune with us emotionally and the most wonderful, protective, well behaved guard dog any expecting mom could dream of. So, he has always been protective but this past week or so he has seemed anxious and won't leave my side when I'm home with him (I'm 8 weeks) 
He has fathered 2 litters with another dog so that lead me to maybe think he does understand or somehow sense the baby? Anyone else had experience with this? I can't think of any other reason he would all of a sudden seem more anxious (not in a bad way) just different 
Thank you in advance!:)