I have no idea if this is pregnancy related or not, but it didn't start until after I got pregnant, and got worse in the last 3-4 weeks. It is always 75-80 degrees in my house since my mom has MS and is always cold. But anyways at least 3 times a day I start to shiver extremely bad, and happens at random times. It's not just a chill down my back either... My whole body shakes. Has anybody else had this before?