I'm new on Mumsnet and find it so useful reading everyone's advice, so now I've got a question of my own I'm hoping people can help. I'm 17 weeks and have developed a strange feeling in the very bottom of my tummy in the past couple of days, in the muscles that you would normally clench to hold your tummy in. They feel like they don't want to clench, and I can generally feel pressure in the area when I try the clench. Is this normal? Just the muscles stretching perhaps? It's so difficult to know if all is well as I'm not feeling the baby moving yet so I'm convincing myself that this means something's wrong. What do people think?