HI this is very strange and hard to describe but i am 17 wks with baby no 5---arggh. I have got big quite quickly but it is obviously low down although my "bump"seems to be quite rounded under my boobs too.Ihave noticed for ages that if i twist my body it feels like my upper abs jerkily poop out in a spasm. It doesnt hurt and goes back in when i twist back. I havent had it before in pg and lately it is getting more frequent. What is going on? I am going to see Dr next week. Any similar stories? I doubt it. It seems weird.