I am not sure what kind of touchy stomach you are takling about though. For me, I only get overstretched or uncomfortable from the weight of the stomach. And I just make sure my daughter doesnt press on my stomach. :O)
Yes, my tummy is sensitive as well. My 7 year old likes to cuddle with me on the couch every night and if he leans against me the wrong way, it's a very funny feeling. Not quite painful, but not good at all.
Yes I had that, it is quite normal. Your baby is moving around and growing.
My belly is sensative too. Sleeping is becoming more and more difficult. I use a pillow between my knees and under my belly. I also get weird pains when I move wrong during the day. I figured it was from my muscles stretching.
Sometimes it is a little sensitive but I am used to my son digging his knees into me all day so I am not surprised I am sore.