Toddler sense pregnancy

Latanya • I’m a Social Worker-elderly and disabled population. i have two boys ages 4 and 2 with boy/ girl twins on the way!!!
My little boy is 2 years old and he seems like lately he has been really clingy and whiny.. He has been wanting me to hold him which he usually doesnt want me too... It's like he knows I'm pregnant! Or maybe it's just in my head lol