I'm almost 34 weeks pregnant with my 5th kid. i have been getting back pain, head aches and loose stools. are these signs of labor coming soon?

Maybe: Loose stools can cause contractions. The headache isn't likely related to labor. It could just be a headache, unless you have an elevated blood pressure. If the back pain is constant, its less likely labor. If every few minutes lasting 30-60 seconds its more likely contractions. The only way to know for sure is call your OB and see if they want you to get on a fetal monitor.