help ?

Kristianna
Okay so I will be 30 weeks tomorrow.. I'm having a bad back pain on my lower right side. I feel like I need to puke, my stomach feels weird/hurts, I feel weak kinda, maybe like I have to poop ( sorry tmi ) I have no idea what this is.. 
Braxton hicks?? Maybe preterm labor? Please give me what you think. I'm scared & a FTM..