Help!! Experiences!!

So I’m 24 weeks. This past week I’ve had diarrhea for two days. Along with lower back pain that didn’t go away with changing positions, hot relief, stretches, massages etc. Third day after the diarrhea was over the lower back pain continued. I had a lot of BH when walking around. I don’t feel them but notice my stomach tightening. As well of a lot more discharge, more in the morning after standing up. It just soaks through and goes down my leg. It’s the same when laying down for half an hour and standing up but not as much. I know it’s not urine doesn’t smell and I was tested for all infections yeast etc. a few days before this happened. It was all negative. The day after all those other symptoms continued but another symptom came up which is pressure in the bum and vaginal area more when just standing up. Now today a new one which is pelvic pain an lower cramps (not bad) along with all the above symptoms excluding the diarrhea that stopped on day two. It hurts to walk or lift my leg. I had preterm labour with one of my kids but that was long ago so I don’t remember what it felt like. I went in to the hospital for excess fluid. They hooked me up to the monitor told me I was having contractions and was already dilated. My other labour’s only lasted 1-2 hrs and I didn’t feel the contractions till I was about 5-6 cms or my water burst.

Do this sound like preterm labour again? Any similar experiences?