Labor?

Anna • Pregnant with baby boy coming march 2016, gonna be a lil brother to our beautiful daughter!!
Im 33 weeks pregnant, and i had terrible cramps and back pain i figured its bc i had to use the bathroom and i was correct i have diahre but i also ended up puking all my breakfast up as well right after my bowel movement. Has anyone had anything like this happen. I had hot flashes and got very hot right after and now just feel weak and still in the bathroom just incase i need to puke again. Any insight thank you