Ok, I'll bite.  It happened to me. I didn't know until I went into labor. I am 5'5 and weighed 140 at delivery. No stomach, no kicking. They estimated him at 8 months. He's turning 8 this year, and is wonderful. Wants to be a Blue Angel or paleontologist.  I had zero symptoms and even went to the doctor during the 8 months. Period continued, didn't gain more than 5 lbs, and he was just very still. Everyone was beyond shocked.