Is it normal that I feel like my stomach is always full?

Bárbara • I'm 29, and I have a beautiful baby girl born on May 30th, 2017 ^^ I also have a dog named Oliver and I love him lots!
I been feeling like my belly weights now, I never felt like that before, also it feels like I'm always full even when I wake up (still feel hungry tho) is this normal? I'm 21w3d, and before now I never felt like my belly was heavy!