Can babies/kids sense pregnancy?

Ch

I'm a little over 4 weeks pregnant and for the last week my 10mo son has been so clingy it's driving me crazy! I have to pry him off me to give him to the sitter, if I leave his sight he freaks out and comes crawling to find me. I can't do anything without having to hold him. I love his cuddles but I'm starting to feel a little suffocated. Anyone else experiencing this???