16 weeks and a day is it normal for that to happen

I'm 16+2 today but yesterday I was 16+1 well yesterday morning i was lying on my bed and my bump went weird the top half sunk away in and the bottom was sitting out I think the baby was stretching because I felt the baby is it normal for to see the baby stretching already it looked like the baby was pushing its body out down at the right side of my stomach near freaked out