Possible pre term labor signs?

I'm 34weeks4days been loosing mucus plugs after mucus plugs for almost two months now, having some medium spotting, diarrhea, and now acid reflux and heart burn so bad that no matter how many tums, ranitidine, milk I do nothing is helping I got a sever pressure on my upper abdomen and chest that I'm power puking. Has anyone else experienced this right before going into labor???