Clinging toddlers

Anyone else's toddler extremely clingy?

Even though he spends 95% of his time with me...

My 2 year old has been extremely attached to me lately. Im 21 weeks pregnant with another baby boy and I'm always so uncomfortable. My toddler loves to throw himself on me, basically sit on my belly and chest and whenever we lay together he has to put all of his body weight against mine which adds about a solid 30 extra pounds on top of my own body weight. I'm just wondering is he sensing a baby and wanting to be closer to me or just being a wild 2 year old or does he just love his mama?! Lol