Pet-moms? Did your pet detect your pg?

Georgia
I rescued a dog when he was a pup from a isolated town. He's 12 months, and very much apart of our family. 
I'm 6 and a half weeks pregnant, and I noticed Tanner my dog started to sniff my area (usually when I am expecting AF). And he kept sniffing my area, and his new behavior is howling (which he never used too!). His other behavior now is he seems more cautious of my every move, and is nicer towards me. He usually is hyper! 🐶 
Curious if anyone else had something similar or has stories to share?