Who knows the signs of labor?

I need help! My yorkie is shaking really bad, and my dog thermometer just broke. She isn't nesting, but now shes really tired and i think the shaking stopped. is that a sign? I need help! This is my first dog pregnancy, and im really nervous. ive studied alot on this site and on other sites, and i think i know what to do but im really nervous! PLEASE HELP!!!

oh and shes due anytime now!