And position of baby, my first you couldn't even tell I was pregnant until about 5 months until that time I just looked chunky. He was sitting in closer to my back and one morning I woke up and he'd just rolled over and I looked huge. And I was a size 3 when I got.pregnant with him
Your baby is just now getting to the point where it can even move enough to make your belly that way. Also depends on your weight.
Im 4months also&my stomach is not hard
I am almost four months and my stomach has not gotten hard either. Everyone carries differently so i would not worry