When I lay down on my sides or my back I can feel this hard knot like bump mostly rite about my…

When I lay down on my sides or my back I can feel this hard knot like bump mostly rite about my belly button in my tummy, when I push on the bump I feel something move in another part of my tummy also. I'm 11W today, and am a very tiny girl, 105lbs pre pregnancy & I'm 5'1" I don't know if it's too soon to be feeling baby or what is going on. This is my first pregnancy. Any ideas girls!? Thank you!!❤️👶🏼