I saw someone post about this years ago and it described what I was feeling but no follow ups were made. I am 31 weeks, but wake up some nights and feel a shaking in my stomach that lasts around a minute. It is very subtle to the point that I can't tell it is the baby or not. I put my hand to my stomach and can't feel anything until I add pressure and it feels like a shivering movement. Sometimes it will happen more than once a night. Has anyone ever had this?