Uterine Cramping way before period?

Julie
My next period is coming in around two weeks, and my last was about two weeks ago. I'm experiencing intense uterine cramping that's also along with nausea and grossly, a lot of poop. The nausea increases when I stand up. I've had a bit of disharge the last couple days, but nothing abnormal. I'm not sexually active. What could this be?