Ok this is really weird but, for the past few nights, I have been having brief stomach pain when I turn over in my sleep at night. The pain doesn't feel like muscles but more like I have a bad stomach ache, right in my gut, for a good minute or so when I turn from left side to my back, right side to left side, etc. Now I'm worried I'm doing something harmful to the babies? Has anyone else experienced this or know what it is? Should I stop? I have always tossed & turned in my sleep and never felt this before.