This might sound mad but you know how a random muscle in your eyelid of cheek sometimes twitches on and off all day or for a few days for no reason...has anyone else had that happen in their uterus (or that area of abdomen)?? 
I'm not imagining it because I can feel the spasm when it's happening if I put my hand on it.
It's been over a week on and off and it's driving me nuts. Definitely not pregnant. Feels like there's a bird or an alien in there!