Preterm labor?? 35 weeks 🎀

So yesterday I lost my mucus plug or some of it... It was very large and well looked like snot. It had no blood to it though. I was feeling bad days before this happened but even more now. This pregnancy is much different then my last so I'm reaching out for advice. I've been experiencing horrible back pain and sharp pain in my lower abdomen but I didn't feel contractions with my son or this child just sharp pain and in my back.. Thoughts ? I'm #35weeks btw.