Labor symptoms?

For the last 3 days i have been sick to my stomach, warmer than normal, extremely tired, eating like a pig, sucking down like 12+ cups of water, and now today i have been having lower back pain, tightening in my uterus, off and on cramps and a lot of pelvic pressure. On top of this i keep feeling like i have to poop. Anyone else feeling like this or did and went into labor?