Early back labor??

I’m 36 weeks pregnant and I noticed when I went to the bathroom that my panties was really wet and it didn’t have a smell but now my lower back has started hurting very bad! To the point I’m feeling very nauseous and I’m feeling crampy too but my back pain will ease a little then get really intense.... Does this sound like early back labor?? Should I go to L&D?? If so, when??